Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eb6a35d45e7e70…

MALICIOUS

PDF

42.4 KB
MD5: eca78e0ed80bfec2adc7c1019d590b6f SHA-1: 6e0dc112d0050ff8ced0c393f51ceb1e74ade485 SHA-256: c4eb6a35d45e7e7080ba8d99b1ea893a696620cc0f100ec321c1849959808bc4
188 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV which identified it as 'Pdf.Exploit.Agent-36830'. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to exploit vulnerabilities within the PDF reader. The ML classifier output of 0.999995 further supports its malicious nature. 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
1d3a59fbd9ed95856b02741602e79ca25f36dbfe57aac8f7a7cd06b31940e033		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42683 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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