Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b1c3c2a96590b6…

MALICIOUS

PDF

11.7 KB
MD5: 2a5209a37a7ca4a7a6d15df3d5e5ef19 SHA-1: a731d46237a785463044c552a64b88a7eb0e9590 SHA-256: d6b1c3c2a96590b6bef0a95e2fcd1a077d561bc4c1069d1d1a40f193b1cd018a
128 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score. The presence of an embedded script payload and an embedded file strongly suggests it's designed to exploit PDF vulnerabilities and drop a secondary payload. The embedded URLs, while mostly unknown or benign, are part of the PDF 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
32e62d225bffd9a1d44b3c4af117a683bf42320d0978d42a28260bf8c7220798
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11248 bytes