Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd047e99fdf233d4…

MALICIOUS

PDF

42.7 KB
MD5: f87c2e7deb0dab2ac5b3b25ff0f0f0cb SHA-1: 08ccd3309faa14e3eafd2026b3d8dbaba69cabea SHA-256: bd047e99fdf233d4f121a264a26f3f913d08e4d614b090a7c993377820900c54
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating it is malicious. The presence of an embedded script payload and an embedded file suggests it is designed to exploit a vulnerability and download a second-stage payload. The ClamAV detection name 'Pdf.Exploit.Agent-36830' is included as a primary IOC.

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
a6e50927b60f44c846c11b49108dc6784fe9aeb94c3658d4e0d80d801fd81f0e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42987 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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