Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4c0b42eecdca83…

MALICIOUS

PDF

19.4 KB
MD5: d93b0d05aae5a2e6960f4094e230f703 SHA-1: 4b51b68b661d8ca180dab9208bc91a767cbe8aa2 SHA-256: ae4c0b42eecdca83d6e6e29978aa24b132a5c7b8ffccce81cd0df41664d6a8d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1055 Process Injection

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically 'Pdf.Exploit.Dropped-78'. It contains an embedded script payload and an embedded file, indicating it is likely designed to exploit a vulnerability and download a second-stage payload. The document body content is not human-readable and appears to be malformed or obfuscated data.

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
ebb319add581160f9dae5c580dc128b3a4091e3d60c76a5c2ea3620ea1dacb36
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19065 bytes