Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcef25070d0ee6e6…

MALICIOUS

PDF

93.5 KB
MD5: c9497f43e157340b3ccbdb0f007f5826 SHA-1: 8a24e76ffe1e39623ca88b8bdc11627963f44b81 SHA-256: fcef25070d0ee6e62daa08dbba05f184fec546d4ff77cfb92b4bae71709b30e3
178 Risk Score

Malware Insights

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

The PDF utilizes XFA forms and contains an embedded script payload, as indicated by multiple high and critical heuristic firings including ClamAV detection. The ML classifier also flagged it with high confidence. While the document body and script content are not directly interpretable for specific user lures, the presence of an embedded script payload strongly suggests it is designed to download and execute a second-stage payload. The embedded URLs are related to XFA schema but do not appear to be directly malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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.
  • 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_pdf_script_00000246.bin
72d6e458f2c20b85058abe6f356f73d53c1f0af3a44d6109417adbe7e65475dc		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94994 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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