Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f1f5b83dc3f5ac…

MALICIOUS

PDF

100.5 KB
MD5: 128b75c64ed1c1b27e34d0a0d394b54c SHA-1: b8868a5af14f1bf6deff2d8dac5a20daeb443f3f SHA-256: 86f1f5b83dc3f5acdb655490051ae102c735a0b1b3f67d866e374753ecd188b0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript within an XFA form, a common technique for exploiting PDF vulnerabilities. The embedded script is heavily obfuscated but appears to be designed to download and execute a second-stage payload, as indicated by the ML classifier and ClamAV detection. The script's obfuscation and truncated nature prevent a more detailed analysis of its specific actions or the exact URL it may contact.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000246.bin
c29002e210acbcdc0f57fa5f9045868abf46389aa8032f3f9b76b0b74938ec85		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102150 bytes

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