Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d2c9addbaf507…

MALICIOUS

PDF

82.7 KB
MD5: e856e417cb377dc4783d78aa9c074f0a SHA-1: c125bb5e563d1d7531ef72c2a97eda481f7bce51 SHA-256: dc3d2c9addbaf5074c667895739f8f2e462e3570c2882ad31fc51a8c9b7124d8
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment

The PDF file utilizes XFA forms, a known vector for exploitation. Heuristics indicate an embedded script payload and ML classifiers strongly flag it as malicious. ClamAV detections further confirm its malicious nature, identifying it as Pdf.Exploit.Agent. The embedded script is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured by the PDF structure.

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
ec41ede0c23e499770637fc0efeb88a407e12f651fe168b56bc9db96bea979ad		 pdf-embedded-script PDF raw stream script payload at offset 0x246 83929 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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