Malicious PDF — malware analysis report

Static analysis result for SHA-256 55040682f1c7e52b…

MALICIOUS

PDF

79.3 KB
MD5: 2ff7fa179b8197dda7c6b3100d6b381b SHA-1: ef1b33755c7776c719727282638bc8de6c327eef SHA-256: 55040682f1c7e52b55a240f63578dfd7f6ec1d9a167f559fe319104e0dadb0dd
178 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV, and exhibits characteristics of an exploit, specifically using XFA forms and an embedded script payload. The ML classifier also strongly indicated maliciousness. The embedded script is likely responsible for the exploit delivery, though its specific actions are not detailed in the provided evidence.

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
54156f0db5f083a3b1b507de44ae269bb803b9d4b34cd9bb0e522b05003ce662		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80467 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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