Malicious PDF — malware analysis report

Static analysis result for SHA-256 7785c1263e5417ed…

MALICIOUS

PDF

31.6 KB
MD5: 02fd0f20cfcc18321da055df1b83448c SHA-1: dc172b9ab4af189b5e07bd50ce5c239c67acc2f3 SHA-256: 7785c1263e5417ed4cf318eb8ebe9052fb6fc5648dc2dc1b06bf1c9ef5082ae0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains an XFA form with executable script, identified as a numeric evaluation stager. This script is likely designed to download and execute a second-stage payload, as indicated by the ML classifier and ClamAV detection. The embedded URL, while seemingly benign, is part of the XFA structure and may be used in the exploitation chain.

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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