Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b798fc17b6157b…

MALICIOUS

PDF

32.1 KB
MD5: bb9e69ce4110ad3c20194e2ad7c71f60 SHA-1: 88d4d93807f40a03827d0e0558bbe89b270c53b3 SHA-256: 74b798fc17b6157b2ac973dff0416f1e1837dc8a2bee24c00b121eeb9745812e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains a malicious XFA form with executable JavaScript, identified by the PDF_XFA_SCRIPT and PDF_XFA_NUMERIC_EVAL_STAGER heuristics. The ML classifier strongly indicates maliciousness. The embedded URL, while seemingly benign, is part of the XFA structure and likely used in conjunction with the script to initiate a malicious chain of execution, potentially downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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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