Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fa73c76809a270…

MALICIOUS

PDF

3.9 KB
MD5: 66fade6032a07a17149e67cfd411cfe8 SHA-1: 81ed0a23814adb022d49b9d6e1b1784b17a95588 SHA-256: b5fa73c76809a270f2276d5a77b0efc4cbcb76f6feab8e25d48496d1d0e2f021
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 a malicious PDF exploiting known vulnerabilities. The presence of PDF-specific heuristics like JavaScript actions, embedded JS streams, and decoding filters (ASCIIHexDecode, ASCII85Decode) further supports this, suggesting the PDF is designed to download and execute a secondary payload. No document body text was available for analysis.

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