Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfb3a4323812752…

MALICIOUS

PDF

42.5 KB
MD5: ec379e822bff73f39f78108d8801a0b9 SHA-1: d9df6069ae2df3e275672c5837e6c6fbafdbc632 SHA-256: 6bfb3a432381275272f8d71fbd18d6498486e729d72193d36de81e5fa4fa5be1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and ClamAV detection (Pdf.Exploit.Agent-36830). The ML classifier also strongly flagged this PDF as malicious. The embedded script is likely responsible for exploiting a vulnerability to execute arbitrary code, and the file was likely delivered as a spearphishing attachment.

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
f3dce5fce0bee9b825926876bafaa5674812134a1de0906966f50406ad56a76a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42787 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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