Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f2cd7833a15506…

MALICIOUS

PDF

19.3 KB
MD5: 3446db8ac50085249d6edf64c462d5d2 SHA-1: bf9a6106c2162b1da591c98916522b0446c67b45 SHA-256: 36f2cd7833a155066e0de3d35b55af8cf9bb681633642544b18d194c66fe11ea
126 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to exploit a PDF vulnerability. The ML classifier also strongly indicates maliciousness. The embedded file is likely the second-stage payload.

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
7e1718b749ad8b477e94d92a4afd61ca95c050ac6493e59ab31055654b25515c
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18990 bytes