Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f42a1a7f6756262…

MALICIOUS

PDF

32.6 KB
MD5: 0204fe9957f9d4414030490761dd27af SHA-1: 678b631346b510b02fb86b14fa88c0b2be051cec SHA-256: 9f42a1a7f6756262a01254e35b96d54823cf300584dd689f024b2d5907dcc1ae
178 Risk Score

Malware Insights

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

The PDF was flagged with critical heuristics for containing risky executable scripts within an XFA form and for being detected by ClamAV as Js.Exploit.HTML-30. The presence of an embedded URL and the ML classifier output further support its malicious nature. The XFA numeric stager suggests it's designed to evaluate and execute code, 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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