Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55f4bfd8bb639c4…

MALICIOUS

PDF

82.7 KB
MD5: f4137ff43261b80c7d83471d3c206fc4 SHA-1: 7f8a470609f4b2148cc21943a49299deed0e0b3c SHA-256: f55f4bfd8bb639c4eecbd35a091afa96ca9f5110ab20a0640e5dee7f2404058b
178 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Agent-6136306-0) and a high ML score, indicating malicious intent. The presence of an embedded script payload within a PDF stream, combined with XFA form usage, suggests an exploit delivery mechanism. The embedded artifact, also detected by ClamAV, further supports this. The exact script functionality could not be determined due to obfuscation, but the overall pattern points to a malicious PDF designed to execute an embedded exploit.

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
d9d3b6ab5fd289e87e043bc0993d86635889cb0ad103687216441e1ab21ff11f		 pdf-embedded-script PDF raw stream script payload at offset 0x246 83929 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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