Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84f166ba013f481…

MALICIOUS

PDF

79.0 KB
MD5: ae73701eeeb3d63d79e089d51e5f6195 SHA-1: 1b3b216b399d619ab6f32c0fbf67b77cd85fd676 SHA-256: b84f166ba013f48161aac33e3711e8e3846f42efe9044ff7b350bd4fb5f5802a
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file utilizes XFA forms, a known vector for embedding malicious content. Static analysis detected an embedded script payload within a PDF stream, which was further confirmed by ClamAV as 'Pdf.Exploit.Agent-6136306-0'. An extracted artifact also triggered a JavaScript exploit signature. The embedded script is likely responsible for downloading and executing a second-stage 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.
  • 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_0000023c.bin
0464feea18b7f2ef1dc30a6ebd7fabc3884d1d3deeeb9cad3b8c0c5fbd4dee2b		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80195 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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