Malicious PDF — malware analysis report

Static analysis result for SHA-256 05426fd5642d2c62…

MALICIOUS

PDF

42.9 KB
MD5: ac45aafedda8e963f9929b49895d0aaa SHA-1: ef113149587dfc2090fe2e70def9b565bb2bb8e0 SHA-256: 05426fd5642d2c6208d041d5d5bef6ee0f54539b4e286c23e42135d857c06b3e
176 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics and ClamAV as malicious, specifically indicating an exploit. The presence of embedded script payloads and embedded files strongly suggests that this PDF is designed to deliver and execute a secondary malicious payload. The ML classifier output of 0.999994 further reinforces the high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36836 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36836
  • 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
6fd18dc25e24727d79826496199bb096c2c63ea818af61afbe3791818199a394		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 689 bytes
embedded_file_obj0010.bin
e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45E 93 bytes
embedded_file_obj0011.bin
53fb849c0aa92b93651aeb0e1931a7a60107595a6538a8e2e3814ce02d31fe42		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x506 503 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x748 190 bytes
embedded_file_obj0014.bin
f671f41997462392c1f66cef67e06904805811a07db5cca82d9c9fdc94eb8dc5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x853 41025 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA8DE 147 bytes

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