Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9873f685db3584…

MALICIOUS

PDF

100.5 KB
MD5: 1f61666b850fd6c09d435da778ed3725 SHA-1: 8ce7baebe2a6cb3e97287664aba8f2c746e9ef2b SHA-256: cd9873f685db35843fcb66711a25177fcbfbb851230012c6fcf9c2836b8d9c72
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains an embedded script payload and utilizes XFA forms, which are known vectors for exploitation. The ML classifier and ClamAV detections strongly indicate malicious intent. The embedded script is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic.

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
7586e4ef201f8530b4baa21f68e13f430b47e8f4494fd56182d197b6b5d96170		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102154 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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