Malicious PDF — malware analysis report

Static analysis result for SHA-256 accbb4d51780ea3c…

MALICIOUS

PDF

43.1 KB
MD5: e825a3076eeb327049c8b94e565997fc SHA-1: 0436da2fa71faf20e3ed907c468ddf2e22467eca SHA-256: accbb4d51780ea3c2558979ad83be207d08aac4e5e1b75a39cf8723c5396d319
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The file is identified as malicious by multiple high-severity heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36834). The presence of embedded script payloads and embedded files strongly suggests an exploit attempt. The ML classifier output of 0.999994 indicates a very high probability of maliciousness. The embedded artifact names and ClamAV detection point to a known exploit targeting PDF documents.

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
5ae68ac65d15cebecd6bd5ea3f1c25ff5aec79dddc94b61acb980d35a8040059		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 688 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45D 100 bytes
embedded_file_obj0011.bin
4ba28a1351d92440823f453887ca75548682432d32122600039a022cba84aca5		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50C 706 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x819 190 bytes
embedded_file_obj0014.bin
4388a7545635d55e45c09dd279f62b652e19bf0662009b05e2fcd47ade40054d		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x924 40980 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
03172373f36e220deaea3baf69186e2a8bef99633879227f39b2a0b4510201ee		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA982 138 bytes

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