Malicious PDF — malware analysis report

Static analysis result for SHA-256 176d89d70dfd53b2…

MALICIOUS

PDF

43.0 KB
MD5: 19d0f452b2e3d77762b6adc153aae740 SHA-1: 2ec2eacaa8351daf10f9b8f522cf96dd902aad8b SHA-256: 176d89d70dfd53b2262168520dcf4623e71c273480420c79d6a5703fa736ef60
176 Risk Score

Malware Insights

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

The PDF file contains embedded scripts and is flagged by multiple heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36836'. The presence of XFA forms and embedded files suggests an attempt to exploit client-side vulnerabilities for code execution. The ML classifier also strongly indicates maliciousness.

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
e4956cdcd747309487379d47323c8e3900f9d8cc629d12798777e5d3b2ca465f		 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
4d9d0361bbbedae57b2489f6440c28b51bd056feeaf13b736a93bfdf8a11cbe3		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x506 512 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x751 190 bytes
embedded_file_obj0014.bin
5ac7eb41e2b6795ea69e45ad3bf7ff8602c1249f0069d0698a13210cac685ab5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x85C 41103 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 0xA935 147 bytes

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