Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c93cc4384873f01…

MALICIOUS

PDF

34.3 KB
MD5: c56d66a9fe9b47d7916355e3642dada4 SHA-1: 79babd8b178f82d71e3fb6633e2dacdfe26d78ba SHA-256: 1c93cc4384873f0136cd362d9ad3941a40d2afeb91735908953655fed0cfcb7a
178 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Exploit.Dropped-92 and a machine learning classifier indicated a high probability of maliciousness. The presence of XFA forms with executable scripts and a numeric evaluation stager strongly suggests an exploit attempt. The embedded URL, while seemingly benign, is part of the exploit chain. The primary attack vector appears to be leveraging XFA scripting to download and execute a further stage.

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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