Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7602fc84004470…

MALICIOUS

PDF

5.1 KB
MD5: d71d69c6dc39e63ee88b97e5f7fe28e7 SHA-1: b1e29a6c6272d31e7508c80901aac8363a84b440 SHA-256: ca7602fc840044709e3ab4476eeaa746453761acf282bc01663b0d2effac6380
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by multiple engines, including a high-confidence ML classifier and ClamAV. Heuristics indicate the presence of JavaScript, embedded JS streams, and the use of filters like ASCIIHexDecode and ASCII85Decode, which are commonly used in PDF exploits. The ML classifier's output of 0.999986 strongly suggests a malicious exploit is present. No document body text was available for analysis, but the combination of PDF-specific exploit indicators and the ML score points to a likely exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

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