Malicious PDF — malware analysis report

Static analysis result for SHA-256 965cf7dce7d13010…

MALICIOUS

PDF

3.9 KB
MD5: 4b72dbd03262fc62b6fc87991bfdb8f5 SHA-1: ab96d6a882b277f54f328892a6b1bb3a87e4835d SHA-256: 965cf7dce7d13010a32bca353062ceadd97dacc0f82599241539be0b7201c7bf
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 PDF exploit. Low-severity heuristics for JavaScript actions, embedded JS streams, and string decoding functions (fromCharCode, ASCIIHexDecode, ASCII85Decode) further support this. The presence of these elements suggests the PDF is designed to leverage a vulnerability to run malicious JavaScript, likely to download and execute 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