Malicious PDF — malware analysis report

Static analysis result for SHA-256 83276388eb014e5e…

MALICIOUS

PDF

31.9 KB
MD5: 9f6e2208be165b41b99e4b5e1d5c3ddb SHA-1: db26b7da01998e0bfc03a63f8bed34476f8b29c1 SHA-256: 83276388eb014e5eda9a69c8a78f1eab16844a1fa818a9df74562b21b7372bde
178 Risk Score

Malware Insights

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

The PDF contains an XFA form with executable script, identified as a numeric evaluation stager. ClamAV detected this as Js.Exploit.HTML-30, indicating it's designed to exploit vulnerabilities via JavaScript. The embedded URL, while seemingly benign, is part of the XFA structure and could be used in conjunction with the script to download additional malicious content.

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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