Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2a75a8fce74b29…

MALICIOUS

PDF

42.8 KB
MD5: a183511359b43847b5486fe66d3f0c02 SHA-1: e27340dd6b1a40d4b134ac78064f998e25d7449c SHA-256: cd2a75a8fce74b297d88f16e73c6a7cadf29cec5d9bedd498c94400db9dc094c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The file is identified as malicious by multiple high-severity heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36834'. The presence of embedded script payloads and embedded files strongly suggests that this PDF is designed to exploit vulnerabilities and deliver a secondary malicious payload. The ML classifier output of 0.999994 further reinforces the malicious nature of the file.

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
429918171d928d58bf4da331ad8daf37e349218e7d1cf658ea07c706d5cf19fc		 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
324841dff068fff626d3691740af73f99920a3173ab3bcf091014ef1f5d880be		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50D 558 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x786 190 bytes
embedded_file_obj0014.bin
ab8b32d7c5e001612d7743955b26a5dbbb3c2742e65d91b51d92c1ccd16c831f		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x891 40832 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 0xA85B 147 bytes

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