Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e047424973165e8…

MALICIOUS

PDF

32.2 KB
MD5: a0358f4d142f9a221901be1be2884258 SHA-1: fae8c2921a5258201ebee0d11e78de85c542ac85 SHA-256: 8e047424973165e84dffbd98068cf0e760dda89a951ce5f3a074ec8048716cfe
178 Risk Score

Malware Insights

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

This PDF file was flagged by multiple high-severity heuristics, including PDF_XFA_SCRIPT and PDF_XFA_NUMERIC_EVAL_STAGER, indicating the presence of executable script within an XFA form. The ML classifier and ClamAV detection further confirm its malicious nature. The embedded URL, while seemingly benign, is likely part of the exploit chain. The script's purpose is to evaluate numeric expressions, a common technique for stagers to download and execute further 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: Pdf.Exploit.Dropped-92 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-92
  • 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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