Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d50f9ba8c3cbe39…

MALICIOUS

PDF

31.9 KB
MD5: 08e7ed8e77c91a194d6b57c3136cf82e SHA-1: 9e8ea2e9d12ee599d3db8b5547f99f795d3a7998 SHA-256: 5d50f9ba8c3cbe39fb9fe68944222a9bd204b4549d0ebe491d7b4b498cf2d6b5
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. It contains an XFA form, which is often used to embed malicious JavaScript. The embedded URL, while seemingly benign, is part of the XFA template structure. The JavaScript is likely used to exploit a client-side vulnerability for execution.

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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