Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fb76bf24ff251a…

MALICIOUS

PDF

42.5 KB
MD5: e73797e48222d1110b4a1ff8539c2163 SHA-1: 3ff9b69cf28c06b3f346902605d5f6eab76067a8 SHA-256: 80fb76bf24ff251a12d389cabddcf0b0b668bf104538e026997781931600feaa
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution T1059 Command and Scripting Interpreter

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36830'. The presence of an embedded script payload and an embedded file strongly suggests that this document is designed to exploit a PDF vulnerability. The embedded script, though obfuscated, likely facilitates the download and execution of a second-stage payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic.

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
df5e84ab14445ba3ff761776326800ee37ac4fef5e010f7fe0a12db6bbc459a6		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42766 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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