Malicious PDF — malware analysis report

Static analysis result for SHA-256 776fc74a8cd0b34f…

MALICIOUS

PDF

42.8 KB
MD5: 401ac26372e205181a9724c5a26ad4cd SHA-1: dcd899e2d739f3ef968c59e6bf9eb1615724fde0 SHA-256: 776fc74a8cd0b34f306001f8708df235f111afe70b2ed25d88deeb4e106c2140
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample was flagged by multiple heuristics, including ML classification and ClamAV detection as 'Pdf.Exploit.Agent-36830', indicating exploitation of a known vulnerability. The presence of embedded script content and an embedded file suggests the PDF is designed to download and execute a secondary payload. While specific JavaScript code was not fully decipherable due to obfuscation, its presence points to T1059.007. The overall confidence is high due to the critical detections.

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
8473386cfc43388da76af24d52bb1ceb601a7b31517061e0b061915b037effea		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43062 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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