Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13938f9c29a3de1…

MALICIOUS

PDF

43.0 KB
MD5: b2882006d8186623089ea2954d175cfa SHA-1: 0f7520d8806a4a22b807b76b4737c9873c4902f6 SHA-256: a13938f9c29a3de1c501f6fb4fea53f9479f07d84f8b1cba2d0e11b18a093c43
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The file is identified as malicious by ML classifiers and ClamAV with the signature Pdf.Exploit.Agent-36830. It contains an embedded script payload and an embedded file, indicating it's designed to exploit PDF vulnerabilities. The embedded script, though obfuscated, appears to be JavaScript responsible for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_file_obj0008.bin
a4cdee03a2046c4fd69e5d256bd9071cc7253525154eca6361e0856c76078ab2		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43288 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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