Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ed0e4ace2c9525…

MALICIOUS

PDF

24.5 KB
MD5: a6d2ae48e92e2f6630afa97f8faf2f21 SHA-1: 64a617ab07160d46294c870acd2cac64e00edc50 SHA-256: e6ed0e4ace2c952527656deea03a6313c01ceea4c6ee862c9ce9059866171636
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains a high-severity XFA script and a numeric evaluation stager, indicating it's designed to execute code. ClamAV detected this as Js.Exploit.HTML-30. The embedded URL, while seemingly benign, is part of the XFA structure. The primary attack vector appears to be the exploitation of XFA forms to run JavaScript, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.HTML-30
  • XFA numeric character-table eval stager high PDF_XFA_NUMERIC_EVAL_STAGER
    PDF XFA initialize script reads numeric form data from rawValue, maps the values through a short character table, and evals the reconstructed stage. This is an exploit-kit staging technique even when the final decoded layer remains encoded.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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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