Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21fc895b1407e81…

MALICIOUS

PDF

42.0 KB
MD5: 483e05a46b2d188d44bfcdd2343c6326 SHA-1: fa2c4b74a8c4cfff67b069712139794cb2abf3b5 SHA-256: b21fc895b1407e8130e776022c8f4ec7d45e32ad2c587482ecb13a727bb86108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1553.005 Subvert Trust Controls: Mark-of-the-Web Bypass

The PDF file contains embedded content and a script payload, as indicated by the PDF_EMBEDDED and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. ClamAV detections for 'Pdf.Exploit.Agent-36830' on both the main file and an extracted artifact confirm its malicious nature. The embedded script likely facilitates the execution of a secondary payload, contributing to the overall attack.

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
21eb2cc608cccfffcf82ae64c3633a84d895cf9876daf04122f0cb214aac2fa9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42287 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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