Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad77e43f2405c0…

MALICIOUS

PDF

42.6 KB
MD5: aae2ee075db57643f0f870e0fd71442e SHA-1: aa8adfe180695785042fa1709f6af747dc7a7962 SHA-256: fbad77e43f2405c0bb6b4c94bf11eafaaf3fcf20169365c81095e3981a26a2bf
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36830, and a machine learning classifier also flagged it with high confidence. The presence of an embedded script payload and an embedded file further indicates malicious intent. The primary attack vector appears to be exploiting a PDF vulnerability to execute a malicious 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
8cc3542cb9e8d8272d620c41366d00a1cedd15d593f3f3c7cd502222fdac85de		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42894 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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