Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bef1b57bf601d93…

MALICIOUS

PDF

82.9 KB
MD5: 906fc2ddf081dc5ed9c016bf3f569799 SHA-1: b020a7262192fef9019317d884ed6e0c6fa8774b SHA-256: 6bef1b57bf601d93c5dcca8d867a124100ec18e9133167878781a3aa79798586
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating an embedded script payload within an XFA form. The embedded JavaScript, though obfuscated, likely attempts to download and execute a second-stage payload. The specific exploit used is not detailed, but the overall pattern suggests a malicious PDF designed for initial compromise via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
97efa5d54f823540fbf6345906b17085db3f01ce295550e86b2bc894f9df3fc9		 pdf-embedded-script PDF raw stream script payload at offset 0x246 84199 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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