Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b4d3c85f0358df…

MALICIOUS

PDF

42.7 KB
MD5: 46443cbfb8f05b90ed746753ff787934 SHA-1: 2349548f7afbe359a655f5a56acb92c47a0330a4 SHA-256: e4b4d3c85f0358df95e03b734b3283bf4fbdf835ff3c52179489f5bda2ab1813
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter

The PDF file contains XFA forms with embedded executable scripts, as indicated by multiple high and critical heuristic firings including ClamAV detection for 'Pdf.Exploit.Agent-36830'. The embedded script is likely designed to exploit a vulnerability within the XFA processing engine to download and execute a secondary payload. The presence of embedded files further suggests a multi-stage attack.

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
765c7ce1476e79a4571dcd5c57f7a5d351ce30749f4e4c65a6fb0a20c0b43991		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 683 bytes
embedded_file_obj0010.bin
b9dc770324ae2a66fd1d9c8b9605e3a9ddaae9d1311dffe002d37a59fdc6e4bc		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x443 183 bytes
embedded_file_obj0011.bin
8c6ab37869e1dbd265a246c95ccd8db05b935327a8bf70895043c2d189f83257		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x545 355 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F3 190 bytes
embedded_file_obj0014.bin
9b7328fecfe3009040f871008eb0667e1b0457378605abb9213d4daf41a7fad4		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7FE 40940 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 0xA834 68 bytes

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