Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e8c9136f5708fb…

MALICIOUS

PDF

42.3 KB
MD5: 91f1b2e0f6551286b7c07794bffc8523 SHA-1: 8ecfa10c14e8494bfc042a62e8f112c5c6fa1115 SHA-256: e4e8c9136f5708fb3fa21211396c51d04a5919f8b6a07f7fa9ce8e4beb435c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The critical ClamAV heuristic firings indicate this PDF file is malicious, specifically detecting it as 'Pdf.Exploit.Agent-36830'. The presence of an embedded script payload and an embedded file further supports the conclusion that this document is designed to exploit vulnerabilities and deliver a secondary payload. The document body content appears to be obfuscated script or data, not user-readable text, suggesting a non-standard delivery mechanism.

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
858403b7ee01ee8379bfbb8f2478725d687d46202692977ee1231c8c7cbf2f52		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42603 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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