Malicious PDF — malware analysis report

Static analysis result for SHA-256 774e3720f5b0320b…

MALICIOUS

PDF

19.0 KB
MD5: 5c7f1f393c9adda194b1b4a256e0a978 SHA-1: 3f498f78727744e61d2972a4f1cbafb1e61825bd SHA-256: 774e3720f5b0320b7391211e60b4688dace4527fac21f0a31472cab3d7a728d0
116 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78', indicating it contains an exploit. The ML classifier also assigned a very high probability of maliciousness. The presence of an embedded script payload and an embedded file further supports the conclusion that this PDF is designed to deliver a secondary malicious payload to the victim's system.

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
d311106bc33abe2c18ee495f34ba210478a476bb36e98f5951d6a2518dc4c757		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18731 bytes

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