Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ebb4058838698f…

MALICIOUS

PDF

31.7 KB
MD5: 7055bb2a38d3f9596a02e35836b7464e SHA-1: c23aa1638e1a663b0bbf47e19be9d4094da2b988 SHA-256: c5ebb4058838698fdd888ac1cc437a9e4a0504bac0b1305a2aac3d8f6020b3ce
148 Risk Score

Malware Insights

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

The PDF contains an XFA form with executable scripts, identified by the 'PDF_XFA_SCRIPT' and 'PDF_XFA_NUMERIC_EVAL_STAGER' heuristics. ClamAV also detected it as 'Js.Exploit.HTML-30'. The embedded URL is likely used to fetch and execute a secondary payload. The script's exact function is obscured, but the overall pattern suggests a downloader.

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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