Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc3ca93b1f93f72…

MALICIOUS

PDF

11.7 KB
MD5: 05e69693b87c0d1a14a176cca0891942 SHA-1: 21ead903bc30f23cce85f726ef75ccf28ab0ec67 SHA-256: edc3ca93b1f93f725df69292e1680c8a52f7bf0b2e206ab796a2bb0af2d2aecc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF was flagged by a machine learning classifier with high confidence and also detected by ClamAV as Pdf.Exploit.Dropped-78. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it is designed to drop and execute further malicious content. The embedded URLs are related to XFA forms, which are known to be exploited in PDFs.

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
7110139c7e5c590064624e585d8d9d6e2d1664b4074a71ffe202fa18f76b8822
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11256 bytes