Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0aebd5805dc76d…

MALICIOUS

PDF

42.6 KB
MD5: c7c6e173dce398cb0482adea503dd7f0 SHA-1: e8de6f3906f0f173946051514542ef09a6049e13 SHA-256: 4b0aebd5805dc76d1b15d0d66eeee1cd37332f04c37ff78890fe49e6119b5cf6
186 Risk Score

Malware Insights

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

The PDF exhibits multiple indicators of maliciousness, including embedded scripts and a high ML classifier score. ClamAV also detected it as Pdf.Exploit.Agent-36830. The embedded script payload suggests an attempt to download and execute a second-stage payload, which is a common attack vector for PDF-based malware. The presence of XFA forms and embedded files further supports its malicious nature.

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
44af43cd1c687bdac2752937d7ad9c921a011e295eeb5a459b8d40a1ba46a4ee		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42833 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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