Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb53f96bd53d9de5…

MALICIOUS

PDF

79.1 KB
MD5: 16861b12e3ac17f3c7808d488c0b39ab SHA-1: e06dd6ecd98e13adcf9ebd8f26b29f7f8100a4d9 SHA-256: cb53f96bd53d9de5e9c1eb1c86fb9c12b4206630ac8a96387a6731a63f1a8e4c
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious PDF

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of an XFA form and an embedded script payload suggests an exploit is being used to deliver a secondary malicious artifact. The embedded artifact itself was also detected by ClamAV. The URLs present are related to Adobe XFA and do not appear to be 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_0000023e.bin
62f194199d971795590d1dfe6142b1daf884f8299238a62681caae9c3c0d06b6		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80301 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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