Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53f2bf16d952e0d…

MALICIOUS

PDF

42.4 KB
MD5: a7faf93fbadc6be428390f1b01628c42 SHA-1: 9acfa72028e18550d7cffb65d02aaee5b58c828c SHA-256: a53f2bf16d952e0d8d8b16d3bdc1979c419cd9ed26a5cc590e55c4f8d8008885
186 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Exploit.Agent-36830. An embedded script payload was identified, and an embedded file artifact was extracted, indicating the PDF is likely used to deliver a secondary malicious payload. The ML classifier output of 0.999995 further supports the malicious nature of the file.

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
0351a550d3b6dbd4346e09dca4b5493d3a8c683241c3930156583d1d9782abb8		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42685 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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