Malicious PDF — malware analysis report

Static analysis result for SHA-256 d323c25f5abf3ed3…

MALICIOUS

PDF

42.3 KB
MD5: f67a44e6711e072766acc7506a47e45e SHA-1: bf549082f719f43d6623e9730e7dd05768b19cb6 SHA-256: d323c25f5abf3ed345b866214f3a98c20fb240fc23994b1fd0dcf143d9cd8ba5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The file is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically indicating an embedded script payload and exploit. The ML classifier assigned a very high probability of maliciousness. The embedded script likely attempts to exploit a vulnerability within the PDF reader to download and execute a secondary payload. The presence of XFA form elements and embedded files further supports the exploit vector.

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
94b72cd87e286ea433ed9d6c8bd1f7ec101e2bf758b90be096fccf40f15daaf3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42592 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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