Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4f74d40ef58d14…

MALICIOUS

PDF

93.6 KB
MD5: c1a3ff90a61ca877f6d46a6c85db1079 SHA-1: 249170d43d36522f08b96b190f0876cc323f3039 SHA-256: 1b4f74d40ef58d147c6c64c08e2c16911b3c3e71e084dfe057e11bf0eed76b52
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.007 Command and Scripting Interpreter: JavaScript

The PDF utilizes XFA forms and contains an embedded script payload, as indicated by multiple high-severity heuristics including ML classification and ClamAV detection. The embedded script is likely responsible for delivering the malicious payload, although its specific actions are not detailed in the provided evidence. The ClamAV detections provide specific identifiers for the threat.

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.
  • Embedded script payload in PDF stream medium 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.
  • 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://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
83ed9a3ad31281a965cf0d1099a1f54fc2a77a1e6865f14c54739e69e70be89a		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95094 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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