Malicious PDF — malware analysis report

Static analysis result for SHA-256 166270da09c0f194…

MALICIOUS

PDF

42.6 KB
MD5: 7b549dcd3e8cbd01914ce285e881bbeb SHA-1: 6bcef4c24be80139330646ceca48d7dcbe6b21c2 SHA-256: 166270da09c0f1949e4210e3a88d5aa6195ecfdaddf15e795052fcf37bef012b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded scripts and embedded files, indicating an attempt to exploit vulnerabilities within the PDF reader. The presence of XFA forms and embedded script payloads suggests the execution of arbitrary code, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36834 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36834
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • 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 0xD7 67 bytes
embedded_file_obj0009.bin
67d6e61c4b4d6cd2b7bd04a0371bd8fda0af7ee2d89ddd2eaea3f730718db7e8		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 690 bytes
embedded_file_obj0010.bin
1870a8c90be73ebe36ae508f57c55ef58407515a4ad8c7e867914369cf2923c9		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45F 99 bytes
embedded_file_obj0011.bin
c087658ad41c03dbeb0dc373c76a8edd0bd466b20e5f1ccd25b9b87ca85c14ae		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50D 584 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x7A0 190 bytes
embedded_file_obj0014.bin
445a229b2c2ab192f0400298885d084b988f43806a2ff6786e91a176c8d37b93		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8AB 40655 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA7C4 68 bytes

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