Malicious PDF — malware analysis report

Static analysis result for SHA-256 611f672eff609ea7…

MALICIOUS

PDF

42.6 KB
MD5: c92552e55f1f55fd9c7c9a174a6e0fb8 SHA-1: 753894ce9787bad3e9e3f9485606fcfad793c63d SHA-256: 611f672eff609ea7eb79d7eb2aa6d888e6119396ff21facbf38be46f68144fea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file was flagged by multiple critical heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36834', indicating it contains an exploit. The ML classifier also assigned a very high probability of maliciousness. The presence of embedded files and XFA forms suggests the PDF is designed to deliver a malicious payload, likely exploiting a client-side vulnerability for code execution.

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
dd6c70c86b8fc67d05010ced3c9f18c696151dd486289dba1f11d39870e69683		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 684 bytes
embedded_file_obj0010.bin
1870a8c90be73ebe36ae508f57c55ef58407515a4ad8c7e867914369cf2923c9		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x459 99 bytes
embedded_file_obj0011.bin
ca2ab72b7266e9b8d36a987dfd01ca3acb5f528149945b8de5fa03f4f9f1bc6d		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x507 572 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x78E 190 bytes
embedded_file_obj0014.bin
26d2bbdff8af8a7f5be234d3c4881b6100ef2b80dd350f18d726741b01544576		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x899 40704 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 0xA7E3 68 bytes

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