Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b4de6d2869a3a…

MALICIOUS

PDF

12.0 KB
MD5: 9ffa41cec260ff03b3afb82cdac01c99 SHA-1: 86c2594fa6b3000ed671a1849424e4317313149d SHA-256: 308b4de6d2869a3ae2a96da5e02ed5a98497761f7c687a7a7e04f66539b969b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78, and a high ML score. Heuristics indicate an embedded script payload within the PDF stream, suggesting it's designed to exploit vulnerabilities and deliver a secondary payload. The presence of an embedded file further supports this. The document body content is not human-readable and appears to be obfuscated script or data.

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
ebce0778db992d69dcdf7a1f0a32cbb706b7fa33acb3c730f20da407c14e0d06
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11564 bytes