CVE-2019-8066
📋 TL;DR
This heap overflow vulnerability in Adobe Acrobat and Reader allows attackers to execute arbitrary code by exploiting memory corruption. Users running affected versions of Adobe PDF software are vulnerable when opening malicious PDF files. The vulnerability affects multiple versions across different release tracks.
💻 Affected Systems
- Adobe Acrobat DC
- Adobe Acrobat Reader DC
- Adobe Acrobat 2017
- Adobe Acrobat Reader 2017
- Adobe Acrobat 2015
- Adobe Acrobat Reader 2015
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malicious PDF files delivered via phishing or compromised websites lead to remote code execution on the victim's machine, enabling data exfiltration or malware installation.
If Mitigated
With proper patching and security controls, the risk is limited to isolated incidents that can be contained through endpoint protection and network segmentation.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious PDF file. No public proof-of-concept has been released, but heap overflow vulnerabilities are frequently weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Acrobat DC/Reader DC: 2019.012.20036 and later; Acrobat 2017/Reader 2017: 2017.011.30144 and later; Acrobat 2015/Reader 2015: 2015.006.30499 and later
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb19-41.html
Restart Required: Yes
Instructions:
1. Open Adobe Acrobat or Reader. 2. Navigate to Help > Check for Updates. 3. Follow the prompts to download and install available updates. 4. Restart the application when prompted.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allDisabling JavaScript reduces attack surface as many PDF exploits rely on JavaScript execution
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allEnable Protected View for files from potentially unsafe locations
Edit > Preferences > Security (Enhanced) > Enable Protected View at startup
🧯 If You Can't Patch
- Restrict PDF file handling to sandboxed environments or virtual machines
- Implement application whitelisting to block unauthorized PDF readers
🔍 How to Verify
Check if Vulnerable:
Check Adobe Acrobat/Reader version against affected version ranges listed in the advisoryCheck Version:
Help > About Adobe Acrobat/Reader (Windows) or Acrobat/Reader > About Adobe Acrobat/Reader (macOS)Verify Fix Applied:
Verify version is updated to patched versions: 2019.012.20036+, 2017.011.30144+, or 2015.006.30499+📡 Detection & Monitoring
Log Indicators:
- Application crashes of Adobe Acrobat/Reader
- Unusual process creation from Adobe processes
- Memory access violations in application logs
Network Indicators:
- PDF file downloads from suspicious sources
- Outbound connections from Adobe processes to unknown IPs
SIEM Query:
source="*adobe*" AND (event_type="crash" OR process_name="AcroRd32.exe" OR process_name="Acrobat.exe")