Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9bff6b94cb8928…

MALICIOUS

PDF

12.1 KB
MD5: ca6004217b85b10984f44ab7ee332fec SHA-1: 1106ed387bd5f5596c077ec791b0b8f2f02ee5e1 SHA-256: 8c9bff6b94cb89288c303d4f222fe8268d7b1b43cbe5a53bcb715090eef47f88
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score. The presence of an embedded script payload and an embedded file strongly suggests it's a dropper or exploit document. While no specific script content was detailed, the PDF structure and embedded artifacts indicate an attempt to exploit vulnerabilities and deliver a secondary payload.

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
ffe84bdb062ac91b201bdda7ff3d3fb47831824011d50dc7988a1352433d924c
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11650 bytes