📄 Description (English)
PDF Explorer 1.5.66.2 contains a structured exception handler (SEH) overflow vulnerability that allows local attackers to execute arbitrary code by overwriting SEH records with malicious data. Attackers can craft a payload with buffer overflow, NSEH jump, and ROP gadget chains that execute when the Custom fields settings dialog processes the malicious input in the Label field.
🤖 AI Executive Summary
PDF Explorer 1.5.66.2 contains a critical SEH overflow vulnerability (CVE-2018-25217) allowing local attackers to execute arbitrary code through malicious input in the Custom fields settings dialog. With a CVSS score of 8.4 and publicly available exploits, this poses an immediate threat to organizations using this PDF processing tool. No patch is currently available, requiring immediate mitigation through alternative controls.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 24, 2026 06:57
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi government entities, financial institutions, and legal firms that rely on PDF Explorer for document processing. High-risk sectors include: Banking (SAMA-regulated institutions processing legal documents), Government agencies (Ministry of Interior, Ministry of Justice), Healthcare organizations (managing patient records in PDF format), and Law firms handling sensitive contracts. Local privilege escalation capability makes this particularly dangerous in multi-user environments common in Saudi corporate infrastructure. Organizations using shared workstations or terminal servers face elevated risk.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Legal Services and Law Firms
Healthcare and Medical Institutions
Energy and Utilities
Telecommunications
Insurance
Real Estate and Property Management
🎯 MITRE ATT&CK Techniques
T1055 - Process Injection
T1574.012 - Hijack Execution Flow: COR_PROFILER
T1547.001 - Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder
T1548.004 - Abuse Elevation Control Mechanism: Elevated Execution with Prompt
T1190 - Exploit Public-Facing Application
T1203 - Exploitation for Client Execution
T1559.001 - Inter-Process Communication: Component Object Model
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all systems running PDF Explorer 1.5.66.2 across the organization
2. Restrict access to PDF Explorer to trusted users only; disable for non-essential personnel
3. Implement application whitelisting to prevent execution of PDF Explorer if not critical
4. Disable Custom fields settings dialog functionality if possible through group policy or configuration files
COMPENSATING CONTROLS:
5. Isolate systems running PDF Explorer on a separate network segment with restricted outbound connectivity
6. Implement strict file integrity monitoring on systems running the application
7. Deploy behavioral monitoring to detect suspicious process execution and code injection attempts
8. Enforce Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) at OS level
9. Run PDF Explorer in a sandboxed environment or virtual machine with limited privileges
10. Disable SEH-based protections bypass by enabling Control Flow Guard (CFG) where supported
DETECTION RULES:
- Monitor for PDF Explorer process spawning cmd.exe, powershell.exe, or other shell interpreters
- Alert on PDF Explorer accessing registry for persistence mechanisms
- Detect unusual memory allocation patterns or ROP gadget chain execution
- Monitor for Custom fields dialog box interactions with oversized input buffers
UPGRADE PATH:
11. Evaluate alternative PDF processing solutions (Adobe Reader, Foxit Reader, or open-source alternatives)
12. Plan migration away from PDF Explorer to a supported, actively maintained PDF tool
13. Test alternative solutions in controlled environment before full deployment
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع الأنظمة التي تعمل بـ PDF Explorer 1.5.66.2 في المنظمة
2. تقييد الوصول إلى PDF Explorer للمستخدمين الموثوقين فقط؛ تعطيل الوصول للموظفين غير الأساسيين
3. تطبيق قائمة التطبيقات المسموحة لمنع تنفيذ PDF Explorer إذا لم تكن حرجة
4. تعطيل نافذة إعدادات الحقول المخصصة إن أمكن من خلال سياسة المجموعة أو ملفات التكوين
الضوابط البديلة:
5. عزل الأنظمة التي تعمل بـ PDF Explorer على قطاع شبكة منفصل مع اتصالية خارجية مقيدة
6. تطبيق مراقبة سلامة الملفات الصارمة على الأنظمة التي تعمل بالتطبيق
7. نشر المراقبة السلوكية للكشف عن محاولات تنفيذ العمليات المريبة وحقن الأكواد
8. فرض منع تنفيذ البيانات (DEP) وعشوائية تخطيط مساحة العناوين (ASLR) على مستوى نظام التشغيل
9. تشغيل PDF Explorer في بيئة معزولة أو جهاز افتراضي بامتيازات محدودة
10. تعطيل تجاوز الحماية القائمة على SEH بتفعيل Control Flow Guard (CFG) حيث يكون مدعوماً
قواعد الكشف:
- مراقبة عملية PDF Explorer التي تولد cmd.exe أو powershell.exe أو معالجات shell أخرى
- تنبيه على وصول PDF Explorer إلى السجل لآليات الاستمرارية
- الكشف عن أنماط تخصيص الذاكرة غير المعتادة أو تنفيذ سلاسل ROP gadget
- مراقبة تفاعلات نافذة الحقول المخصصة مع مخازن مؤقتة ذات حجم مفرط
مسار الترقية:
11. تقييم حلول معالجة PDF البديلة (Adobe Reader أو Foxit Reader أو البدائل مفتوحة المصدر)
12. التخطيط للهجرة بعيداً عن PDF Explorer إلى أداة PDF مدعومة وتحت الصيانة النشطة
13. اختبار الحلول البديلة في بيئة محكومة قبل النشر الكامل
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.5.2.1 - User access management and authorization
A.5.2.3 - Management of privileged access rights
A.5.3.1 - Password management
A.6.1.1 - Segregation of duties
A.6.2.1 - Event logging and monitoring
A.6.2.2 - Protection of log information
A.7.1.1 - Malware protection
A.7.2.1 - Patch management
A.8.1.1 - Incident management procedures
🔵 SAMA CSF
Governance - Policy and Risk Management
Governance - Compliance and Audit
Protection - Access Control
Protection - Data Protection
Detection - Monitoring and Alerting
Response - Incident Management
🟡 ISO 27001:2022
A.5.1.1 - Policies for information security
A.5.2.1 - User registration and de-registration
A.5.2.3 - Management of privileged access rights
A.6.1.1 - Segregation of duties
A.6.2.1 - Event logging
A.6.2.2 - Protection of log information
A.7.1.1 - Anti-malware
A.7.2.1 - Patch management
A.8.1.1 - Incident management
🟣 PCI DSS v4.0.1
Requirement 2.2.4 - Configure system security parameters
Requirement 6.2 - Ensure security patches are installed
Requirement 10.2 - Implement automated audit trails
Requirement 11.2 - Run automated vulnerability scans
🔗 References & Sources 4
🔗
http://www.rttsoftware.com/
disclosure@vulncheck.com
Product
🔗
https://www.exploit-db.com/exploits/46016
disclosure@vulncheck.com
Exploit
VDB Entry
🔗
https://www.rttsoftware.com/files/PDFExplorerTrialSetup.zip
disclosure@vulncheck.com
Product
🔗
https://www.vulncheck.com/advisories/pdf-explorer-structured-exception-handler-local-co...
disclosure@vulncheck.com
Third Party Advisory
📦 Affected Products / CPE 1 entries
rttsoftware:pdf_explorer:1.5.66.2