Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a62523117a623b…

MALICIOUS

PDF

42.7 KB
MD5: 96b35db9853e4ca22bd63155f075f7c9 SHA-1: 8578b5d6d2b342680dbebac39ecd12a6e4f3fa3a SHA-256: 12a62523117a623b28801d8ff58a1ce47abe5393065c3b6a61d1105e6a98c56c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including ML classification and ClamAV detection, specifically flagging it as 'Pdf.Exploit.Agent-36834'. The presence of PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD indicates that the PDF is designed to exploit vulnerabilities and execute embedded code. The embedded artifacts suggest a multi-stage attack, likely initiated via spearphishing.

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
945e564f67b69bafa07b515042613e563bfb2f047b5ad8a8649ca4abed830a0e		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 689 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45E 100 bytes
embedded_file_obj0011.bin
c14e1b370044daf8599bae20fb22fd70eee8a31b2e113b205a0b30f25acd3a27		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50D 553 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x781 190 bytes
embedded_file_obj0014.bin
c56af3bd81c9384a00b71b441705b8fec1c34845c7b87d01c8301d7b34e1801c		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x88C 40709 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 0xA7DB 147 bytes

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