CVE-2022-27785
📋 TL;DR
CVE-2022-27785 is a use-after-free vulnerability in Adobe Acrobat Reader DC's font processing that allows arbitrary code execution when a user opens a malicious PDF file. This affects users of Acrobat Reader DC versions 22.001.20085 and earlier, 20.005.3031x and earlier, and 17.012.30205 and earlier. Successful exploitation requires user interaction to open a malicious document.
💻 Affected Systems
- Adobe Acrobat Reader DC
📦 What is this software?
Acrobat by Adobe
Acrobat by Adobe
Acrobat by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malware installation or data exfiltration through crafted PDF documents, particularly in phishing campaigns targeting organizations.
If Mitigated
Limited impact with proper application sandboxing, least privilege user accounts, and network segmentation preventing lateral movement.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious PDF). No public proof-of-concept has been disclosed as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 22.001.20085 (Continuous Track), 20.005.30314 (Classic 2020 Track), 17.012.30206 (Classic 2017 Track)
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb22-16.html
Restart Required: Yes
Instructions:
1. Open Adobe Acrobat Reader DC. 2. Go to Help > Check for Updates. 3. Follow prompts to install available updates. 4. Restart the application when prompted.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allDisabling JavaScript reduces attack surface and may prevent exploitation of some PDF-based vulnerabilities
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allForce all PDFs to open in Protected View mode to limit potential damage
Edit > Preferences > Security (Enhanced) > Check 'Enable Protected View at startup'
🧯 If You Can't Patch
- Implement application whitelisting to block execution of unauthorized PDF readers
- Deploy network segmentation to isolate PDF processing systems from critical assets
🔍 How to Verify
Check if Vulnerable:
Check Adobe Reader version via Help > About Adobe Acrobat Reader DC and compare against affected versionsCheck Version:
Windows: wmic product where name="Adobe Acrobat Reader DC" get version
macOS: /Applications/Adobe\ Acrobat\ Reader\ DC.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify version is 22.001.20085 or higher (Continuous), 20.005.30314 or higher (Classic 2020), or 17.012.30206 or higher (Classic 2017)📡 Detection & Monitoring
Log Indicators:
- Adobe Reader crash logs with exception codes related to memory corruption
- Windows Event Logs showing application crashes with faulting module in AcroRd32.exe
Network Indicators:
- Unusual outbound connections from Adobe Reader process
- PDF downloads from suspicious sources
SIEM Query:
source="*acrobat*" AND (event_type="crash" OR exception_code="0xc0000005")