Malicious PDF — malware analysis report

Static analysis result for SHA-256 df05542ad90d52f1…

MALICIOUS

PDF

43.0 KB
MD5: aae10326c7e529eaa12502c084173a7a SHA-1: 13dfe61577e97b66658c301b78fc6b3044551247 SHA-256: df05542ad90d52f1f89b8d0a31d40662334c169e8fc8406dfcb82a06d29bff53
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The file was detected as malicious by ClamAV with the signature Pdf.Exploit.Agent-36836, and a machine learning classifier also flagged it with high confidence. Heuristics indicate the presence of embedded scripts and an embedded file payload within the PDF structure. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest this PDF is intended to exploit vulnerabilities and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36836 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36836
  • 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 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://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
a27db0c0dad1c44e3e1757096aa216224891c8632863899e7b541e868425dce5		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 687 bytes
embedded_file_obj0010.bin
e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45C 93 bytes
embedded_file_obj0011.bin
035d0231245d60d0f9d66ea4d91fc0cd33c0bd71d6fbce272733490bee2413a9		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x504 504 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x747 190 bytes
embedded_file_obj0014.bin
ad4b29ba1f5cb14e7eecafc2d5e14fae2d28ccf15359f8e02d71c16cf271c246		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x852 41127 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA943 147 bytes

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