Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73b9a546e31d57f…

MALICIOUS

PDF

12.0 KB
MD5: df895065490b76ecfc2b6fe36d0b9375 SHA-1: 57fa8fab4c32921f23c9e22b70ef9d1fe040e2bb SHA-256: d73b9a546e31d57f75be869083cef77452e097bb2e33dcf56e57136a854b8c90
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a Pdf.Exploit.Dropped variant. It contains an embedded script payload and an embedded file, suggesting it's designed to exploit a PDF vulnerability to drop and execute a secondary payload. The embedded URLs are not directly indicative of malicious activity but are present in the document structure.

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
2d8236d69f73087f0e7fc7266cf6bb89d6d963b2ca9b1199ae7981575d2537ac
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11579 bytes