Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4aec9172b4f980…

MALICIOUS

PDF

3.8 KB
MD5: 3ab7edc0a833c6ca7570c743c1cf5766 SHA-1: 341fe58d36c80e51a085fa7734b59368d4c7b052 SHA-256: 4c4aec9172b4f980a0890dd1636604624a1b7dbf21540c0548f422a3f2f60f0c
112 Risk Score

Malware Insights

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

The critical ClamAV detection 'Pdf.Exploit.Agent-36178' strongly indicates this PDF exploits a known vulnerability. The presence of multiple PDF-specific filters (ASCIIHexDecode, ASCII85Decode) and JavaScript actions further supports this. The embedded JavaScript, though obfuscated, likely facilitates the exploit execution. The document body is unreadable, providing no further context on the lure.

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