Malicious PDF — malware analysis report

Static analysis result for SHA-256 663b9943d6aaf49c…

MALICIOUS

PDF

79.1 KB
MD5: cca6703db695ce70c2c730b06c7e8d42 SHA-1: 6667f184cc9adf28d0ac6bbc775443fd85e0eaf8 SHA-256: 663b9943d6aaf49ccfad1a9efe5f5a7376922ba4e8c64744058a73664facc7bf
168 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Exploit.Agent. The embedded script, written in JavaScript, appears to be obfuscated but is designed to execute code. The presence of XFA form elements further indicates a potential exploit vector. The script's obfuscated nature and the ML classifier's high confidence suggest it's intended to download and execute a secondary payload.

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_0000023e.bin
10609f675f9a1058672bd20e2e322c267b427b328ca4bcd1f6e7694dc69e34a8		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80303 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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