Malicious PDF — malware analysis report

Static analysis result for SHA-256 1373124da1d0b7f9…

MALICIOUS

PDF

31.9 KB
MD5: fd79b4c45537e7311e07a9ab1100355c SHA-1: 740c5e4d6fb2eaec3093ccffae9e1ca1036c4924 SHA-256: 1373124da1d0b7f9b65bdd54b65bb863eafeb16b14759f2701c73f861f5e89fc
102 Risk Score

Malware Insights

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

The file is a PDF containing an XFA form, which is a known vector for exploiting vulnerabilities. ClamAV detected it as Js.Exploit.HTML-30, and an ML classifier strongly indicated maliciousness. The embedded URL, while seemingly benign, is part of the XFA structure and could be used in conjunction with exploit code.

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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