Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a77205f9123d90…

MALICIOUS

PDF

42.3 KB
MD5: 86139117a9cf1a3cad5b60a64babf0b2 SHA-1: 3bc1890642f1a3b3ecb4641e87d099a11f221ced SHA-256: 06a77205f9123d90d2f3788c2a699ff2b2622786c60683a9b2fbcca30f04b41d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded script content and is flagged by multiple heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36830', indicating it's designed to exploit vulnerabilities. The ML classifier output of 0.999995 further supports its malicious nature. The embedded script likely facilitates the execution of a secondary payload, a common technique for initial access via spearphishing attachments.

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 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 script payload in PDF stream low 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 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
ad653388a4d600b5e7c86b27a55246d3d6f7c5fe8259c1f42db768a37ab386c4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42563 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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