Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a291367f58f25aa…

MALICIOUS

PDF

31.8 KB
MD5: 708c2015b4da861c69260cfcf4547b34 SHA-1: d7f01d9a0abd1c3e8823b9b6b810a8aab683a094 SHA-256: 4a291367f58f25aa89ae85e93b5b893b454bb3a5e64690f1bd615bdf4c7b228f
148 Risk Score

Malware Insights

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

The PDF file contains XFA forms with executable scripts, identified as a stager by heuristics. ClamAV detected this as Js.Exploit.HTML-30, indicating a JavaScript-based exploit. The embedded URL, while seemingly benign, is part of the XFA structure and could be used to load malicious content. The primary attack vector appears to be the exploitation of vulnerabilities within the PDF reader via the XFA scripting engine.

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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