Malicious PDF — malware analysis report

Static analysis result for SHA-256 8839b6f4c10b37e4…

MALICIOUS

PDF

42.5 KB
MD5: 0e3e30ed52410cba460d3afb653bd2af SHA-1: e9a9aae99dd8864b1e21bb5dfcb49bcd29439c4a SHA-256: 8839b6f4c10b37e49b01e7e8848fb2f323b8e405b3af6eae7f27187ebb08db78
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF exhibits multiple high-severity heuristic firings, including embedded script payloads and ML classification indicating maliciousness. ClamAV also detected it as 'Pdf.Exploit.Agent-36830'. While the document body is not directly readable, the presence of embedded artifacts and script payloads strongly suggests it's designed to exploit vulnerabilities and deliver a secondary payload. The embedded file 'embedded_file_obj0008.bin' is a key artifact.

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
14bbb016eeca34f1cd701cc158bbb2209309f39d417437d11d18bb65d370ca7a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42799 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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