Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3b3e002df3e5d0…

MALICIOUS

PDF

42.8 KB
MD5: 9b7f89672e1b6eaf57200bd85d4d0ba3 SHA-1: 79f4e5cbeba1caa03de007518752b38968be6b6e SHA-256: 4d3b3e002df3e5d04489e8d8d14d7fbe4387f92dcdeb83a0cb42ffef6f95176f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious PDF

The sample is a PDF file flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious PDF. The presence of an embedded script payload and an embedded file further supports this assessment. The embedded URLs are not directly indicative of malicious activity but are present within the document structure.

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
e81d0888051eca42cd96f08838c38deb2da685842195b8bd09b632003a252a3b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43039 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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