Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5c38d3bf5d85f9…

MALICIOUS

PDF

79.1 KB
MD5: 2cdd2657c91d173a08818be3793dcd45 SHA-1: 4031bcf80a74673632eed25f5753bb548ef1b6f3 SHA-256: fa5c38d3bf5d85f9441afb366126ead2d2ea24cdb63ce2e28158590a7e69093b
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-6136306-0' and a high ML score. The presence of an XFA form and an embedded script payload indicates an attempt to execute malicious code. The embedded script is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured by obfuscation. The SHA256 hash is provided as a primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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_0000023c.bin
fa2c268d25db6ffe2888a49bea71191215a42eeee5c126787489fd46c7889ca1
pdf-embedded-script PDF raw stream script payload at offset 0x23C 80291 bytes