Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95c984475f5e475…

MALICIOUS

PDF

19.1 KB
MD5: d095058cc22fffe277ab498e40d9f0af SHA-1: 4430dfc100442fceba0c91a526e9e4c0e3be4fb0 SHA-256: b95c984475f5e475f3a86a85d98d99d92b2e36c5a336efa3b1b724b3d92dde4b
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating it's an exploit dropper. It contains embedded content and XFA forms, which are common vectors for PDF exploits. While no scripts were directly readable, the embedded file and heuristics suggest an attempt to deliver a secondary 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
56c00ce82f6c8d3968dd4d1e8963e716ab11197792312f33497c3742fc464a63
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18749 bytes