Malicious PDF — malware analysis report

Static analysis result for SHA-256 955a56e4d589951c…

MALICIOUS

PDF

42.4 KB
MD5: dfd4db31723d4e5b0040d708849c8a17 SHA-1: d26cc93475d9248f439b99986a53bf767dde1a6f SHA-256: 955a56e4d589951c96b36257f524d5968206b3087b259a5d6fe09a98d2cca91b
188 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830). It contains an embedded script payload and an embedded file, indicating it's designed to deliver a secondary exploit or malware. The embedded script, though obfuscated, appears to be involved in the execution of the 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
b169d3b2a53cacb13c18276dd8dccfe80a2f203e729ee73ab794d1996ca3db08		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42696 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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