Malicious PDF — malware analysis report

Static analysis result for SHA-256 0629bd8b63a0b25b…

MALICIOUS

PDF

31.9 KB
MD5: c83ef8e7fe2cafbec7c72cc3aa749ae3 SHA-1: 1331f283c0c4f3f5979feba7413d8fbb455b48a7 SHA-256: 0629bd8b63a0b25b705d12df9c355b30e984da59f6725ee77516d9ca1e1c39f0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically detecting Js.Exploit.HTML-30. It utilizes XFA forms, which are known to facilitate the embedding and execution of JavaScript. The embedded JavaScript, though obfuscated, is designed to exploit vulnerabilities within the PDF viewer, likely leading to the download and execution of a secondary payload. The embedded URL is likely part of this exploit chain.

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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