Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23158f1729cadfd…

MALICIOUS

PDF

42.5 KB
MD5: 726b0507ed6aa7e88ad353e0fafed1dd SHA-1: 242b9f2e3d408690e3503f2867b6352bb9f66d92 SHA-256: f23158f1729cadfd85ccc958d37c3e898592cdd5a4f538eee2bb6b93e3b22b16
156 Risk Score

Malware Insights

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

The critical ClamAV detection of 'Pdf.Exploit.Agent-36834' strongly indicates a known PDF exploit. The presence of embedded files and scripts, along with the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic, confirms that the PDF is designed to deliver and execute malicious code. The embedded script likely attempts to download and run a second-stage payload, a common technique for exploiting PDF vulnerabilities.

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 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
dd7fd3c68637654fbaa1d9ceaa8f3ade9f30705ec8b526fa763457002c8b205b		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 691 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x460 100 bytes
embedded_file_obj0011.bin
4de3b1e8fe085c4093a73d54aca98818ec7eb85f638440692724ad78aa603f4c		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50F 551 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x781 190 bytes
embedded_file_obj0014.bin
74e4576dd071300a171a47212d2b179537b553dc91dba8ac7c4969063c45616f		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x88C 40559 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA745 147 bytes

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