Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d5d8e8113ee6a0…

MALICIOUS

PDF

32.2 KB
MD5: acc58342c40e32b1001b7f399a92a4db SHA-1: 83853758c85c227da2bf2aef76eda989b0b76ce2 SHA-256: 66d5d8e8113ee6a0a6349dfa7b0df1c79f293fe73611e97ddc32c01c0751d57a
180 Risk Score

Malware Insights

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

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Heuristics indicate the presence of risky executable scripts and a numeric evaluation stager within the XFA form. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of a dropped payload via JavaScript.

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: Pdf.Exploit.Dropped-92 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-92
  • 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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