Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e354e0785fb74f…

MALICIOUS

PDF

42.9 KB
MD5: e241b227d059735611097993f775aede SHA-1: 293eab8ab9b9fcec385f54a877f5ae1f2b7a9702 SHA-256: 20e354e0785fb74f39b4c03b2637a8a334515b89234c99d68b7005ebb526ed1a
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious PDF

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating it is a malicious PDF exploit. The presence of an embedded script payload and an embedded file further supports this assessment. The embedded script is heavily obfuscated, making its exact function difficult to determine, but it is likely involved in downloading and executing a second-stage 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
c311cb5966eb2b039925e67a953e46e438d9dc2b48b49c4d164294f89445050d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43184 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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