Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ec56b33e51886d…

MALICIOUS

PDF

31.9 KB
MD5: 75f92939e72ea5f2babb37b025a0f85c SHA-1: cce987843480e6bc3fbe24655ae1ffc547ad882d SHA-256: 98ec56b33e51886d861c59536bff3ce8a631c20da04f86711b6f14629d71df42
148 Risk Score

Malware Insights

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

The PDF file contains an XFA form with executable script, identified as a stager by heuristics. This script is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection of Js.Exploit.HTML-30. The embedded URL, while seemingly benign, is part of the XFA template structure and may be used in the exploitation chain.

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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