Malicious PDF — malware analysis report

Static analysis result for SHA-256 40af2a167b8b85d4…

MALICIOUS

PDF

19.1 KB
MD5: ca74de1d62d14f5d81e36847d5ae5ccb SHA-1: 88be3a2360efe94bfc78c414ed9a95bf265eb1f0 SHA-256: 40af2a167b8b85d4a44f6a7f4ae3f29adf1ea835e34bd2255d8d8083b09fd313
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78'. The ML classifier also flagged it with high confidence. The presence of an embedded script payload and an embedded file suggests the PDF is designed to exploit vulnerabilities and deliver a secondary malicious payload to the user.

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
45936f6149d5e4ba4b6fdafefc33654d4e95edf5ead9f1e15aec438e4e10d295
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18827 bytes