Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d825b9b27e9d587…

MALICIOUS

PDF

42.6 KB
MD5: c11c325b5984d7884e591585dd0ac956 SHA-1: 3aa70ba43624653ab2bd78619d097f4d82f2bcd6 SHA-256: 8d825b9b27e9d587d127a85af22b9fd69c2becef822c8225a8695893f16a0d3d
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The presence of embedded files and scripts strongly suggests it's designed to exploit vulnerabilities and deliver a secondary payload. The ClamAV detection name 'Pdf.Exploit.Agent-36834' points 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
06495be80fed0e9976ee5f54f0372365d901ff62063780b98f11b54f70d1e5a4		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 686 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45B 100 bytes
embedded_file_obj0011.bin
4e060a03a6efd4583480778d3c118d7e8d9358e03edb7b946aa2c835ea25ce08		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50A 565 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x78A 190 bytes
embedded_file_obj0014.bin
5518422314fd72927a236a2510cbdab96c623f7b42bccee3a6db30b48e3cbf22		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x895 40647 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 0xA7A6 138 bytes

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