Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2979c103f1eb2a9…

MALICIOUS

PDF

24.3 KB
MD5: 1073926680c1a00901700c88963c5a37 SHA-1: e50d04442796bdba2e6bf1c0a07d22d6221f385c SHA-256: d2979c103f1eb2a933e40c1084ac79ef0188d3b231c31c681b1a69d4268c6a1c
178 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV with the signature Js.Exploit.HTML-30, indicating it contains exploit code. High-severity heuristics indicate the presence of risky executable script within an XFA form, specifically a numeric evaluation stager. The ML classifier also strongly indicated maliciousness. The embedded URL, while not directly malicious, points to XFA schema resources. The primary attack vector appears to be leveraging an XFA form vulnerability to execute JavaScript, likely to download and run a second-stage payload.

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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