Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2431fb60ab22652…

MALICIOUS

PDF

3.9 KB
MD5: 4a2341b33ebec8939e0ad65d5e05b5ef SHA-1: e49949c284ea4519a862a53b52bfa3d27f622a6e SHA-256: b2431fb60ab2265290f07cee353199aeae735cd3be05556c23ecbee71d58f906
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript and utilizes obfuscation filters like ASCIIHexDecode and ASCII85Decode, indicating an attempt to hide malicious code. ClamAV detection as Pdf.Exploit.Agent-36178 strongly suggests it's an exploit document. The presence of JavaScript actions and streams points to the execution of arbitrary code, likely to download and run a secondary payload.

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