Malicious PDF — malware analysis report

Static analysis result for SHA-256 88294b661e6e2dee…

MALICIOUS

PDF

18.4 KB
MD5: c894beba50c23802d1b93388536ec54f SHA-1: 39a78acc8de4651fcf675398bcbed9b8fbd3b1aa SHA-256: 88294b661e6e2deeae2e2060c7d3a25d51ca4510984b0c26873aa3bb415b0e96
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a Pdf.Exploit.Dropped variant. The presence of an embedded script payload and an embedded file strongly suggests it's designed to exploit PDF vulnerabilities and download a second-stage payload. The embedded URLs, while not directly malicious, are part of the document's structure.

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
6fba5b327c5b5943590aed86ec7e337fc784dec128c49b086c5950fefe053146
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18096 bytes