Malicious PDF — malware analysis report

Static analysis result for SHA-256 82392c9951f4a4b8…

MALICIOUS

PDF

12.2 KB
MD5: 45d5733e022d6bead47b24dd8db83a3f SHA-1: c7fb8791736263bb689fbe3d2fec2842a57fabcb SHA-256: 82392c9951f4a4b8ad90bae15781b5b98f3b46a7f2a62ba6874aba0192657566
116 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded script content and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78'. The ML classifier also strongly indicates maliciousness. The embedded file suggests a dropped payload, indicating exploitation for client execution. Given the nature of PDF exploits, it is highly probable that this file was delivered via spearphishing.

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 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 script payload in PDF stream low 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 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
1f41c3ea6a6c0689e621de1a38d7d8a2806c43845a5d6e81e153e7a5fb4cb11a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11749 bytes

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