Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cd2144b294aa89…

MALICIOUS

PDF

3.8 KB
MD5: 60e8890bf3e18521fec49b95bf6b2d9e SHA-1: b31380b155e108ea840173f1c48350bc1d17abb7 SHA-256: b3cd2144b294aa893877f386a3d39d3d222429fa0d936f425dff8c5bfb584229
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/Shell Script Execution: JavaScript Execution T1204.002 Malicious File: Malicious JavaScript

The critical ClamAV detection indicates this PDF is malicious, specifically identified as Pdf.Exploit.Agent-36178. Static analysis revealed multiple PDF-specific heuristics related to JavaScript execution and decoding filters, suggesting the file attempts to leverage embedded JavaScript. No specific URLs or executable payloads were extracted, limiting further analysis of the script's exact function.

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36178
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation