Malicious PDF — malware analysis report

Static analysis result for SHA-256 604c1464736d20b6…

MALICIOUS

PDF

19.5 KB
MD5: b660b61b3bea702c66c6daaa45b2b373 SHA-1: db2e1ea69d5a43bdecd40f0bc4cc19f3df0f9d7c SHA-256: 604c1464736d20b688c6dd64d3efb84b1a002bb040eb170844ab27c4676dbfd6
116 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded script content and is flagged by multiple heuristics, including ClamAV detection for Pdf.Exploit.Dropped-78. The ML classifier also indicates a high probability of maliciousness. The embedded script likely facilitates the download and execution of a secondary payload, a common technique for exploiting PDF vulnerabilities.

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 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 script payload in PDF stream low 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 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
4562ebea09108147d3f71693efd178d369bb54a5fe59c1c7afa7aafd410c0862		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19183 bytes

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