Malicious PDF — malware analysis report

Static analysis result for SHA-256 199462c763b45f42…

MALICIOUS

PDF

42.5 KB
MD5: f642b00f771fc361e86d3eeae643629b SHA-1: 88828293093ebab92b5ddce48ada392b99d98e22 SHA-256: 199462c763b45f426b608e33d35fee57d4d0959dcfbebff962355b8336259c1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is a PDF document identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36834. It contains embedded scripts and files, indicating an attempt to exploit vulnerabilities within the PDF reader to execute malicious code. The ML classifier also strongly flagged this PDF as malicious.

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
df80ebdbb9e95fdcbc8062bb5be0da8f46fd88810f81da66a200f8a0b8d97cc4		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 688 bytes
embedded_file_obj0010.bin
1870a8c90be73ebe36ae508f57c55ef58407515a4ad8c7e867914369cf2923c9		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45D 99 bytes
embedded_file_obj0011.bin
e3afec08c843d37c15aa7782b11896159385731435f2b176442c26d8a243d1f2		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50B 577 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x797 190 bytes
embedded_file_obj0014.bin
735d3f90a3a714e8deb3b4c1690afc4e54b3c003abcaf1b56b9b37bbf28832f4		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8A2 40610 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 0xA78E 68 bytes

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