Malicious PDF — malware analysis report

Static analysis result for SHA-256 38040c63e74c2687…

MALICIOUS

PDF

3.9 KB
MD5: 639b91c8d9462cffa51d2260bec60de1 SHA-1: 8978e48115153ff8ca9d290f3726f6e5c10a32ec SHA-256: 38040c63e74c268761061ef7f617423134dfc538147a03fb9d66586709a85d68
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript and utilizes ASCIIHexDecode and ASCII85Decode filters, which are common indicators of PDF exploits. ClamAV detection as 'Pdf.Exploit.Agent-36178' strongly suggests exploitation of a known vulnerability. The exact attack vector and payload are not fully discernible from the provided heuristics and obfuscated document body, but the presence of JavaScript points towards code execution.

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