Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c35e03efb3efdd…

MALICIOUS

PDF

42.5 KB
MD5: b6bf36c3a579ee3e66fa425e4d1a4a95 SHA-1: e23f5cc8822f77fef267802096a7d741c754e2c1 SHA-256: b5c35e03efb3efdd7a6898568f63accdd0278d60e390e4bb2b65d8add1e97e5a
186 Risk Score

Malware Insights

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

The PDF file contains embedded content and a script payload, as indicated by multiple heuristic firings including PDF_EMBEDDED_SCRIPT_PAYLOAD and ML_NYX_PDF_MALICIOUS. ClamAV also detected the file as Pdf.Exploit.Agent-36830. The embedded script, though partially obfuscated, appears to be involved in the execution of the malicious payload. The presence of XFA form elements and embedded files further supports the exploitation of PDF vulnerabilities.

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
c64bc96219d638cfab6bb69b2cf87657d2e641cfb297dab2eda99c79d81ec4df		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42788 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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