Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fc7e8de37a4aed…

MALICIOUS

PDF

32.6 KB
MD5: a91f0cad940c73fc4ca26fcf5d9e6849 SHA-1: b6a8dc9fdf1c0ae7d5efdea138276604788ea0af SHA-256: b3fc7e8de37a4aed7307b4f7bd774adce99f86c240ccf768aa317e93f3ecc458
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File

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 primary attack vector appears to be leveraging XFA scripting to deliver a 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: 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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