Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da14d743d1c165c…

MALICIOUS

PDF

32.5 KB
MD5: d276fa602ef494f29703cd1b6f3013db SHA-1: 482d6c84a4449ee84e32bdad4f72d46ba584fc63 SHA-256: 4da14d743d1c165c9e85155cbd0e885292f35d8315de17103157a1e992883f0c
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA (XML Forms Architecture) which is known to be used for embedding executable scripts. Heuristics indicate the presence of risky executable script and a numeric evaluation stager within the XFA form. ClamAV detection as 'Js.Exploit.HTML-30' further confirms its malicious nature. The embedded URL is likely part of 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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