Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38f426a2e868abe…

MALICIOUS

PDF

34.4 KB
MD5: 353ab33b0a36efb61b97a274be74b828 SHA-1: b7a37de41a24798957abbfa572d8c2ea5a5e056e SHA-256: a38f426a2e868abe49ac3334b2257316eaa5ba7624cc4dedfc5b6fa8de7eeaf6
178 Risk Score

Malware Insights

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

This PDF file contains a malicious XFA form with executable script, identified by ClamAV as Js.Exploit.HTML-30. The XFA numeric stager suggests it's designed to evaluate and execute embedded JavaScript. The embedded URL is likely part of the exploit chain. The ML classifier strongly indicates maliciousness.

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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