Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75c28e21aa67c6b…

MALICIOUS

PDF

46.9 KB
MD5: ed4d6f95dc11c32b3f4390bbaafef19c SHA-1: 7123db71e72ca7860670b64e5c84cfe20a707967 SHA-256: d75c28e21aa67c6bca4111ba6ad7c98d646f5d4f0d354f0f525ee82451c5b5d6
228 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.007 JavaScript/VBScript

The PDF file contains embedded XFA forms and scripts, flagged by multiple high and critical severity heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36830'. The ML classifier also strongly indicates maliciousness. The embedded script payload is the primary mechanism for exploitation, likely leading to the download and execution of a second-stage payload. The presence of embedded files further supports the delivery of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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
0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 46 bytes
embedded_file_obj0009.bin
f0d099d4fff99e4d7bd6a133564114512d595d96c5faedefb2861b0cdc77be97		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 689 bytes
embedded_file_obj0010.bin
b9dc770324ae2a66fd1d9c8b9605e3a9ddaae9d1311dffe002d37a59fdc6e4bc		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x449 183 bytes
embedded_file_obj0011.bin
7f536ed3116dddaa7b422479cfeaf2cb0ab425d208f405c52a2ef86b11fe0b52		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x54B 359 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6FD 190 bytes
embedded_file_obj0014.bin
19c3c3bb952729422d3db04753c2f6e553dbeccc06afe03c0a708c06424955d6		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x808 45209 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xB8EB 68 bytes

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