Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02b015c1f3fa575…

MALICIOUS

PDF

19.1 KB
MD5: 9f526615cbf16351d7aa4b0c09832690 SHA-1: 366d17c8030650a134d01f6f61c7fa987a31d27f SHA-256: c02b015c1f3fa575eb80f7cf222fe873f30dd42ab77b7f8f48ee50446297b550
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 within the PDF stream strongly suggests it's designed to execute malicious code upon opening. The embedded file, 'embedded_file_obj0008.bin', is likely the delivered 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
05a3772e2a74e0e5ce0bb98386d0d64ed700e8069d4a3d982cec8b1d65dc31b3
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18750 bytes