Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d820963e9b7653…

MALICIOUS

PDF

42.8 KB
MD5: df7447fc81469f986f96b19c64645f82 SHA-1: 0b8e385a42ae051a561daec79dfc8e19f27b06f1 SHA-256: 14d820963e9b76535e1b7afb5da78eb82c460c0dbbda90e658e5f2bff63b95d3
176 Risk Score

Malware Insights

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

The PDF document contains embedded script payloads and is flagged by multiple heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36836'. The ML classifier also strongly indicates maliciousness. The presence of embedded files and XFA forms suggests an exploit is being leveraged to execute code, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36836 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36836
  • 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
f80c16bcb4370c9220fa4d3482e742db1e42fecb209050fe43ef666cb06a31c9		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 689 bytes
embedded_file_obj0010.bin
e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45E 93 bytes
embedded_file_obj0011.bin
2a23d3af7d635ef6b2e162524ff918f90b96ff70c789f16d0563a14a89092c89		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x506 499 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x744 190 bytes
embedded_file_obj0014.bin
c15a5c90087ca618d6acae8738ac57191b40147a0570ffda1c19a15f0a413287		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x84F 40854 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA82F 147 bytes

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