Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc91bbe35f70c52…

MALICIOUS

PDF

31.8 KB
MD5: 181e57ceb9e8e645f5524cb642a14fe5 SHA-1: 0ef14b6ad5c98e90b872a6c149b8f743882f55f2 SHA-256: 9cc91bbe35f70c52379bf2fdb562adbf6ce4a290a50e73bb2cd83de7950dc816
178 Risk Score

Malware Insights

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

The PDF file contains an XFA form with executable script, identified as a stager by heuristics. ClamAV detected this as Js.Exploit.HTML-30, indicating a JavaScript exploit. The embedded URL, while seemingly benign, is part of the exploit structure. The primary function appears to be downloading and executing a secondary payload, typical of many exploit-based attacks.

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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