CVE-2025-64787
📋 TL;DR
This CVE describes an Improper Verification of Cryptographic Signature vulnerability in Adobe Acrobat Reader that allows attackers to bypass cryptographic protections and gain limited unauthorized write access. All users running affected versions of Acrobat Reader are vulnerable. Exploitation requires no user interaction.
💻 Affected Systems
- Adobe Acrobat Reader
📦 What is this software?
Acrobat by Adobe
Acrobat by Adobe
Acrobat by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify signed PDF documents to inject malicious content while maintaining apparent validity, potentially leading to document tampering or malware distribution.
Likely Case
Limited document modification capabilities allowing attackers to alter certain PDF elements while bypassing signature verification.
If Mitigated
With proper controls, impact is limited to document integrity issues rather than system compromise.
🎯 Exploit Status
No user interaction required, but exploitation requires understanding of PDF signature structure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest version via Adobe's update mechanism
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb25-119.html
Restart Required: Yes
Instructions:
1. Open Adobe Acrobat Reader
2. Navigate to Help > Check for Updates
3. Follow prompts to install available updates
4. Restart the application
🔧 Temporary Workarounds
Disable PDF opening in Acrobat Reader
allChange default PDF handler to alternative PDF viewer
Restrict PDF execution
windowsUse application control to block Acrobat Reader execution
🧯 If You Can't Patch
- Implement network segmentation to restrict PDF file sources
- Deploy endpoint detection to monitor for suspicious PDF modifications
🔍 How to Verify
Check if Vulnerable:
Check Help > About Adobe Acrobat Reader and compare version against affected listCheck Version:
On Windows: wmic product where name="Adobe Acrobat Reader" get versionVerify Fix Applied:
Verify version is newer than affected versions listed in advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected PDF signature validation failures
- Multiple rapid PDF file modifications
Network Indicators:
- Unusual PDF downloads from untrusted sources
- PDF files with modified signatures
SIEM Query:
source="*acrobat*" AND (event="signature_validation" OR event="file_modification")