Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1e67cd4e7757ad…

MALICIOUS

PDF

32.2 KB
MD5: ca74ad3396a2154b398e7c727e593f83 SHA-1: c14e7af37699681fbd6431fbc8f4538be4551947 SHA-256: bf1e67cd4e7757ad1469537dee6245106acb8224233987c351b8165803fbfd4b
178 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple high-severity heuristics, including ClamAV detection of 'Pdf.Exploit.Dropped-92'. The presence of XFA forms with executable scripts and a numeric evaluation stager indicates an attempt to exploit vulnerabilities within the PDF reader. The embedded URL, while seemingly benign, is often used as a lure or a component in the exploit chain. The primary attack pattern involves leveraging XFA scripting to execute arbitrary code, likely to download and run a secondary malicious 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: 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/