Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ef12bf96df6a41…

MALICIOUS

PDF

24.3 KB
MD5: ebdbfac5a97d6e2a6d7ddf53b7fc634d SHA-1: c4fd68679803b19fba5336bc55a7010d5b2c5a7e SHA-256: a4ef12bf96df6a416d0c4dea3243aa9755de93dc75950eafcc2b57549d45af60
178 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV (Js.Exploit.HTML-30) and a machine learning classifier. It contains an XFA form with executable script, specifically a numeric evaluation stager. This indicates the file is designed to exploit a vulnerability within the PDF reader to execute malicious code, likely JavaScript, which is a common delivery mechanism for further payloads.

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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