Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b290a21b8a6ab81…

MALICIOUS

PDF

12.0 KB
MD5: ae7f73003ed2cb28a4240574a993ca24 SHA-1: e6d13a0378da720cd2a4c3c11104364ea0be2055 SHA-256: 4b290a21b8a6ab81da9ffaa4913e5023cc669574f87943720a74ada17c89990a
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML score, indicating malicious intent. The presence of an embedded script payload and an embedded file further supports this. While no specific script content was readable, the overall structure and detections point to a typical exploit 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
f8ce98e122a3fa01050f96fc458852ba2c0c8cfecc82455612ace6e5ef549321
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11581 bytes