Malicious PDF — malware analysis report

Static analysis result for SHA-256 18aedc9d65ce7406…

MALICIOUS

PDF

32.1 KB
MD5: 2aa3a088cdaaed8814d1ba25f99992b0 SHA-1: 95aad0a8b522a2e53e2a9e2b561513a700a8d80e SHA-256: 18aedc9d65ce74066b15c56b99c43d5e398d8edbe1c1003c827a5f154e2fc42d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains a malicious XFA form with executable JavaScript, flagged by multiple high-severity heuristics and a critical ClamAV detection. The XFA numeric evaluation stager suggests it is designed to download and execute a second-stage payload. The embedded URL is likely part of this malicious chain.

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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