Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0244d3917bda0eb…

MALICIOUS

PDF

42.9 KB
MD5: 38b053b42d6097e3b89f206b50756316 SHA-1: c40ff5c073f8a6d3f2a445d9530700c360cfafc9 SHA-256: f0244d3917bda0eb4e659b31a547100ff7b86bdc3c82dcfda1681acea42a697d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The critical ClamAV detection and ML classifier strongly indicate malicious intent. The PDF contains embedded files and scripts, suggesting it's designed to exploit vulnerabilities and deliver a secondary payload. The embedded artifact name 'Pdf.Exploit.Agent-36834' is used as an IOC.

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 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
24dced9a1046263d7f23df9a27bd63fde711fcf426a41ea83fbd950c9d92fafb		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 687 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45C 100 bytes
embedded_file_obj0011.bin
c4413a57c9fe86b812ed1e40d0730ff6af5beca4eb123079c3b5dbf50f220ba9		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50B 552 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x77E 190 bytes
embedded_file_obj0014.bin
c32d6c5ec8f032c01088928ae96183137bec01d332895289fee47965f6a84318		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x889 40917 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 0xA8A8 147 bytes

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