Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c3b358d7367649…

MALICIOUS

PDF

32.0 KB
MD5: 39583e2f4695b888b162540870bf2a6f SHA-1: b89658487c2d72556fce0a87529e78f9ab8eb9ce SHA-256: 87c3b358d7367649a2bf5719c4227c0458c8ca4b7ba5c88e187098823e0f721d
180 Risk Score

Malware Insights

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

The PDF file contains XFA forms with executable scripts, identified by multiple high-severity heuristics including PDF_XFA_SCRIPT and PDF_XFA_NUMERIC_EVAL_STAGER. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded script, likely JavaScript given the XFA context, is designed to evaluate numeric expressions and likely acts as a stager to download and execute a second-stage payload from the embedded URL.

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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