Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1481f9756a2e2b…

MALICIOUS

PDF

93.2 KB
MD5: fbc23b31db42d0ba3ea0e307aae4f262 SHA-1: bc8bd03275442cfc3090cd141613273a068ff281 SHA-256: 1c1481f9756a2e2b770b4bc1619c5e8446f33853fcefec4d85aceb440cc5bafc
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains an XFA form and an embedded script payload, flagged by multiple heuristics and ClamAV as malicious. The ML classifier assigned a very high probability of maliciousness. The embedded script is likely responsible for delivering the malicious payload, although its specific actions are not detailed in the provided evidence. The presence of XFA suggests an exploit targeting Adobe's XML Forms Architecture.

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
8500e28da23f2fb03b6070183502bada351635bf7683d477b478a88c9621dbac		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94714 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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