Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f7b4449ac49753…

MALICIOUS

PDF

80.5 KB
MD5: 1acfb44814aaf48b3412ac47862b591c SHA-1: 7bc593c5f55015a5a1fd2d7db28394e4813a7c85 SHA-256: d2f7b4449ac4975362047c209e0d95e74200ce8323b9b939093be26e950c9eac
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Submitted Malware T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded script content and is flagged by ClamAV as Pdf.Exploit.Dropped-93, indicating it's designed to drop and execute a secondary payload. The ML classifier also strongly indicates maliciousness. The presence of XFA forms and embedded scripts points towards an exploit targeting PDF viewers to initiate a download chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-93 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-93
  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000374.bin
80ac7d88138e0e9e6b1026766bb0089bea0c8272890cea478e4ec52edf2d6e7a		 pdf-embedded-script PDF decompressed stream script payload at offset 0x374 69372 bytes
Detection
ClamAV: Pdf.Exploit.Dropped-93
Obfuscation or payload: unlikely

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