Malicious PDF — malware analysis report

Static analysis result for SHA-256 28539798ab84422e…

MALICIOUS

PDF

43.0 KB
MD5: 5681d893e0d61c22ea5da832da4a7b1d SHA-1: 572f98e3f2a5b4f31b0e3d5c8eaa380e39ea05e9 SHA-256: 28539798ab84422e68eae9e828e3fb21a0f0e44d6de595d081731f7a3989093e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The critical ClamAV detections indicate this PDF file is malicious, specifically identified as 'Pdf.Exploit.Agent-36834'. The presence of embedded files and scripts, along with the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic, suggests the file is designed to exploit vulnerabilities within PDF viewers to execute a malicious payload. The embedded URLs are related to XFA forms, which can sometimes be leveraged for exploits.

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
220d0280220db5b95f69265345d5278567536114f2dec0ea61a7d8c58526a13d		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 686 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45B 100 bytes
embedded_file_obj0011.bin
886b5e1d70ffecf51628a83c2c5363b326575c42d3d8c7b94f00167243d4aaf3		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50A 591 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x7A4 190 bytes
embedded_file_obj0014.bin
ff6087410fe299b7acbddb7f9acb06ce31734cc147fa572e9190deec64f3e51c		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8AF 41028 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
03172373f36e220deaea3baf69186e2a8bef99633879227f39b2a0b4510201ee		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA93D 138 bytes

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