Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc265f1ee574a6e8…

MALICIOUS

PDF

123.5 KB
MD5: b29cb8a34b639aa1ad41fd3dbdaa0220 SHA-1: f5b602ca35a712c569b140a9fdf37b566d32e3fa SHA-256: bc265f1ee574a6e8d3b963c72de64438f42c51fef625cd64560d47610d056a62
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a Pdf.Exploit.Dropped-78. It contains an embedded script payload, indicating it is designed to download and execute a second-stage payload. The presence of an XFA form further suggests a complex, potentially exploitative structure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000329.bin
63e3e29328fffa3a28eb6f956ef273ec549965bbebb07501a49584a1239626cd		 pdf-embedded-script PDF raw stream script payload at offset 0x329 125723 bytes

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