Malicious PDF — malware analysis report

Static analysis result for SHA-256 859f349b787a9c1b…

MALICIOUS

PDF

32.7 KB
MD5: 0a755d5a97e79f14ae23f833b8b72da1 SHA-1: 9ff155c9f6f8d7dd6b7e9ab85261546e7e4f980f SHA-256: 859f349b787a9c1be99cca7c7e8a3f69ee35c78b978ae56d51a334909a6f9e48
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 stager by heuristics. ClamAV detection as Js.Exploit.HTML-30 further confirms malicious intent. The embedded URL, while seemingly benign, is part of the XFA structure and may be used in conjunction with the script 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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