Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b434f855431f3cf…

MALICIOUS

PDF

18.9 KB
MD5: ba0304ebc4b4cfa8a11b95cd4766bbb8 SHA-1: feaa0755c7f9bd3d8a602bf511cfb6dc4ce3c68b SHA-256: 5b434f855431f3cf9c9bc6d82f27db7f5a6ace2bed6b4a014907335eff4ec1d5
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and the ML_NYX_PDF_MALICIOUS score. The embedded script is likely designed to exploit a vulnerability within the PDF viewer to achieve arbitrary code execution. The ClamAV detection of Pdf.Exploit.Dropped-78 further supports this assessment, suggesting the PDF is a dropper for malicious content.

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
a66920f2d77f4c754f99b83186d06828c618f9082662877b6cd39fbeca75cba1		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18589 bytes

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