Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e23aec59b13a2ec…

MALICIOUS

PDF

42.7 KB
MD5: bb0c7cddbb92a13e662cfc59a19d1edf SHA-1: 21b0c22788ac6e2ed01f726a5786e93abed1a0fa SHA-256: 5e23aec59b13a2ece2f4cee2e8840c4d9095a6a70605677b61f34779e4e1f475
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF that contains an embedded script payload, as indicated by multiple heuristics including PDF_EMBEDDED_SCRIPT_PAYLOAD and ML_NYX_PDF_MALICIOUS. ClamAV also detected it as Pdf.Exploit.Agent-36830. The embedded script, likely JavaScript given the PDF context, is responsible for executing the exploit. The benign URLs found are related to XFA forms and do not appear to be malicious.

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 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 script payload in PDF stream low 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 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
e71334ce121fe4d90e91058b80712f796abf4e824a28b0520f86791f0bedd3ab		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42953 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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