Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9b42726684feb4…

MALICIOUS

PDF

11.8 KB
MD5: 98d886a0e26a099cb669592eef545f7c SHA-1: ad707151c8385c6f5a7bac2a6e7cbded7d7f854e SHA-256: 1a9b42726684feb4b990cb00987e012197a4c1ba6b2b5b85c30261ca052b3bdc
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating it's an exploit dropper. The presence of an embedded file and script payload strongly suggests it's designed to download and execute a second-stage payload. The embedded file 'embedded_file_obj0008.bin' is a primary indicator of this malicious activity.

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
8edcdfd4c6b3d98072b06b36be0d7fccc0af7a055a78ba762dbdc43924646f3d
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11335 bytes