Malicious PDF — malware analysis report

Static analysis result for SHA-256 12af8bb98da2d083…

MALICIOUS

PDF

42.8 KB
MD5: 39125135ace97f63af4f043e1da2c982 SHA-1: dbf49fad254c7f8bf659e3d7bdca6aa804915a49 SHA-256: 12af8bb98da2d0834f6ac03501670dab29bd951bdeb53a65c3661a43dcc69f30
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36834, and a machine learning classifier also flagged it with high confidence. Heuristics indicate it's an XFA form PDF containing embedded script payloads and embedded files, suggesting it's designed to exploit vulnerabilities for client execution. The embedded artifacts and exploit signatures point towards a downloader or dropper functionality.

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 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
fcd90e8d7ef7e2764f3d65360a06d90793507fed4c14b491f6f781ffe4f53975		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 688 bytes
embedded_file_obj0010.bin
1870a8c90be73ebe36ae508f57c55ef58407515a4ad8c7e867914369cf2923c9		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45D 99 bytes
embedded_file_obj0011.bin
94b8ad14f6156b118ac151ee8110cee55deda0fea3cfcb392b95dfe3c7c086d3		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50B 582 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x79C 190 bytes
embedded_file_obj0014.bin
712a89f74b622153de6820d93c5f5d9e8fbedae1e58bc01ca014b3d5d0bdad34		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8A7 40916 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA8C5 68 bytes

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