Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3132f360ddb6965…

MALICIOUS

PDF

19.1 KB
MD5: bf1c6de6f2d91d0319769bad23f6dbea SHA-1: 9e7e9f9e8b2e76bfecd7b852f8c20e99c91fbc80 SHA-256: a3132f360ddb69652dd5ae9ac47a81fe0c6ae86992fff5e402483c8d6f313668
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Exploit.Dropped-78'. Heuristics indicate the presence of an embedded script payload within a PDF stream, suggesting it's designed to exploit a vulnerability and deliver a secondary malicious component. The embedded file artifact further supports this delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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
af25ad8fcebca09bdad6f9273cd5e4ca1f56e23df899d7bc640ac54ad8a56722
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18830 bytes