Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd1be643bb8ed92…

MALICIOUS

PDF

31.8 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: a5b4964e20ee41ec28c7a4c3dcbee723 SHA-1: 7155b50581f1d12bd4443d10b2f9c107bafea262 SHA-256: efd1be643bb8ed92ef6b3699910596d82afd371c619b5d5674520109e20852e4
128 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-81' and a high ML score indicating maliciousness. The presence of embedded scripts and embedded files strongly suggests the document is designed to exploit a vulnerability, likely leading to the download and execution of a secondary payload. The ML classifier's output of 0.999992 further reinforces the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 8

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_obj0011.bin
c582ee98f5eb83cb2c5dce7b04b9a0666fe4a9f382864c4aaec1b3715860d056		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x506 29408 bytes
embedded_file_obj0012.bin
103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x7831 323 bytes
embedded_file_obj0014.bin
6a34b324794c506fbd6dbfa05a2e584bfc5348352bd53c09255137659edd58cc		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x79BE 165 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0015.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x7AA9 77 bytes
embedded_file_obj0016.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x7B3D 56 bytes

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