Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec99a0c57b9ab3f…

MALICIOUS

PDF

31.8 KB
MD5: 632d7fc4f31286752deaad23d2635496 SHA-1: a4dc96843949efd6a4f11b5bfe3ae17d2ebeae04 SHA-256: 5ec99a0c57b9ab3fd9aa84bde4156ead3fe271736f0abf3bc74744bb28ee4031
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier, with a high heuristic score for PDF XFA forms. The embedded JavaScript, although obfuscated, is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of an XFA form and the embedded URL suggest an attempt to exploit PDF viewer vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.HTML-30
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.xfa.org/schema/xfa-template/2.5/

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