Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aeeb84f19204536…

MALICIOUS

PDF

31.6 KB
MD5: 2e544da0e7a9af0f652add3ce778c61c SHA-1: 8fcede2ea75141e532523ebd12dc0b74807adde0 SHA-256: 4aeeb84f19204536a74e58320e67b7ddde84b754f09ec412379d0233e6129b4f
178 Risk Score

Malware Insights

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

The PDF was flagged with critical heuristics for containing risky executable script within an XFA form and a numeric evaluation stager. ClamAV identified it as Js.Exploit.HTML-30, indicating a JavaScript-based exploit. The embedded URL, while not directly malicious in reputation, is part of the XFA structure. The ML classifier strongly supports a malicious verdict.

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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