Malicious PDF — malware analysis report

Static analysis result for SHA-256 936fce3b8df63435…

MALICIOUS

PDF

3.0 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: bc8049b82135b17510d77d0b5e65508f SHA-1: a2c4396fa5a0b4a1a983507d954dfd3e70987467 SHA-256: 936fce3b8df63435eda9863381463687755feffc0170b518a96df2608dad9066
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter

This PDF file was flagged as malicious by a machine learning classifier and ClamAV with the signature Pdf.Exploit.Dropped-81. It contains embedded files and an embedded script payload, indicating it is designed to exploit vulnerabilities and deliver a secondary payload. The presence of embedded files and script markers strongly suggests an exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xDB 67 bytes
embedded_file_obj0009.bin
6b2260d3c78649345d3f0b850b831d545d33bb7017ccdf438cdfe1e9db7f2db2		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x167 294 bytes
embedded_file_obj0010.bin
a4e7fc0559523fc43634e7ac4a621c8e46b4fff733241c41499405f234c91c08		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x2D8 483 bytes
embedded_file_obj0012.bin
103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x560 323 bytes
embedded_file_obj0014.bin
90b5db4ee54aa3497622467b48dfbb1db3e96c242591c655b5eff91269fff3b5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x6ED 102 bytes
embedded_file_obj0015.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x799 77 bytes
embedded_file_obj0016.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x82D 56 bytes

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