Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b572ebdefd3e4e…

MALICIOUS

PDF

42.5 KB
MD5: bc68c9f27d63b8f27fb0406adde8f72d SHA-1: b73ab290a008ecbce68d5d9ab959558ba5305096 SHA-256: 53b572ebdefd3e4e1e9fd219a86021e686793e7f657f368731d21d601dd76a5d
186 Risk Score

Malware Insights

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

The PDF file contains embedded script content and was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The embedded script is likely responsible for executing the payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' firing. The embedded artifact 'embedded_file_obj0008.bin' is the likely payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_file_obj0008.bin
b76fd3f01a1470b76eef9dc45873fd420eb98d36c4b849734f379116f234ef08		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42718 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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