Malicious PDF — malware analysis report

Static analysis result for SHA-256 7739ad2baf424302…

MALICIOUS

PDF

19.2 KB
MD5: 4ba61fafe04914cfd10605d1af1c038d SHA-1: 5a7c697fead0b2eb199d34365701caf6a83d61a8 SHA-256: 7739ad2baf424302fb967433f9506f6049799758b352fa45acc2d6b138497fdb
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 script likely attempts to exploit a PDF viewer vulnerability to download and execute a secondary payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'ML_NYX_PDF_MALICIOUS' firings.

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
f1f47c911030119525ebbca406f721f822a0dd13008c03c921c643fb8e7f01fc		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18895 bytes

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