Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cbf9151b09a18b…

MALICIOUS

PDF

19.3 KB
MD5: 3a13dcf84d80c63deb49893f56a742c6 SHA-1: 8f893e49fe34265dc0b6e8bd6448995a90c8360f SHA-256: c9cbf9151b09a18bd042201db9cb5e574d42eaaf75f2b0e20244a5ca0cf9ba1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics as malicious, including an embedded script payload and ML classification. ClamAV identifies it as Pdf.Exploit.Dropped-78, indicating it likely exploits a known PDF vulnerability to drop a secondary payload. The embedded file artifact further supports the delivery of malicious content.

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
2e47272c916fef18ccd8c61a67215ae4591b8a8452d982681c4c71043b6b7952
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18998 bytes