Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b6f53492d71bc…

MALICIOUS

PDF

42.9 KB
MD5: ae4940094d0f736c92ae15adc9cd4a7d SHA-1: 3eaa999134ccb77e148b1348ed1fa31b0db7e0f2 SHA-256: c53b6f53492d71bcc0866bfee3e74ae58fa151e9cc384818d06e431d52fadb82
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating it contains malicious content. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'EXTRACTED_FILE_CLAMAV' heuristics suggest that an embedded script or file is responsible for the malicious behavior. The embedded file 'embedded_file_obj0008.bin' is the primary artifact of concern.

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
0b2a1e42ef4034d13dc6633515b75e6e6094df7fb5e7f2ac6d01c210ca287f1c		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43223 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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