Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abacb5ab6260756…

MALICIOUS

PDF

42.6 KB
MD5: b84bd674b0434a25c4e9cc02e23ee437 SHA-1: 798cf1a5470b42bce586a7ebe51a9eba64251155 SHA-256: 8abacb5ab62607561573620bace9ad4a5ebc5d204bcbaf82f329fbb153e04e51
186 Risk Score

Malware Insights

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

The critical ClamAV detection and ML classifier strongly indicate malicious intent. The PDF contains embedded scripts and files, suggesting it's designed to exploit vulnerabilities and download further malicious content. The embedded artifact 'embedded_file_obj0014.bin' is particularly large, likely containing the primary payload.

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
0b096f29ac924d71e029fe4a2dabbfe081c199740bd6e689263b638bf7a6e01a		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 691 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x460 100 bytes
embedded_file_obj0011.bin
7ca43187634a2e88eb323d6d04945f021a18829428a38d373e7ae4d646a6e851		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50F 546 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x77C 190 bytes
embedded_file_obj0014.bin
46af7d61738e25c44cbd1d799ee91c93babd93351eaa60cf68686d74ef7dff4b		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x887 40598 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 0xA767 147 bytes

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