Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4134ae85b373e08…

MALICIOUS

PDF

11.7 KB
MD5: e61b3735c2d275ec7a4bd72b0e3e0627 SHA-1: a11ccc99146cb15d87de7316a7861f54e8178292 SHA-256: e4134ae85b373e0838b3a7e3f8900ba55d7184c280680822da398cf6b6cb2b12
128 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a Pdf.Exploit.Dropped variant. Static analysis revealed an embedded script payload within a PDF stream, suggesting it's designed to download and execute a second-stage payload. The embedded file artifact further supports the dropper functionality.

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
443b9935ba9eaa00c3c06a00202941bd661ec91752f9093b73e13e9f96c24e8c
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11189 bytes