Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5d92215a274727…

MALICIOUS

PDF

19.2 KB
MD5: e2dd81e2921835c8197d91be2bb3f563 SHA-1: 50d0b81c9ba7b33053146fdb187872e049bbc35d SHA-256: 4c5d92215a274727d57e2d57d9b470582fc9f62b21046f4c5366f06e9a44b82a
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious PDF

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically identified as 'Pdf.Exploit.Dropped-78'. The presence of an embedded script payload and an embedded file further supports its role as a dropper or exploit delivery mechanism. While the exact exploit is not detailed, the heuristics point to exploitation for client execution.

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
b35ac8133a69dd67b3c00aff4ece59f69a290475b652c8852d75f653fcfd6445
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18888 bytes