Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15ff0ef57e3c6da…

MALICIOUS

PDF

32.1 KB
MD5: 71b3f2a0995b641b921af4b750cb40f9 SHA-1: cf13073378e7d5c0685ae168f9b1bf4443f6cdae SHA-256: b15ff0ef57e3c6da1b05077390d7c42bf6f9ed5fd4980decf1fbc86b0a55af6d
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 detection (Js.Exploit.HTML-30) further confirms its malicious nature. The embedded URL is likely part of the exploitation chain. The script's exact function is not fully discernible due to obfuscation, but it is indicative of an exploit attempting to download and execute a second-stage payload.

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/