Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b0bb6596d62690…

MALICIOUS

PDF

42.9 KB
MD5: 3847bb99a9036de2a7e3124097990cc3 SHA-1: 363032a5d552033369de89ef3819ab19a12407b6 SHA-256: f5b0bb6596d6269050426cb4aaa2b60528ff2c743eff9775bb57da9b6ae0d15d
226 Risk Score

Malware Insights

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

The PDF file contains embedded XFA forms with risky executable scripts, as indicated by multiple high and critical heuristic firings. ClamAV detection of 'Pdf.Exploit.Agent-36836' on both the main file and an extracted artifact strongly suggests malicious intent. The embedded script payload is likely designed to exploit a vulnerability within the XFA form processing, leading to the execution of malicious code.

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-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 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
f12b2acbe4d8f1da4eb7af7b6c00c21f4e265e1eefcbce32a386e42dd79fa45b		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 688 bytes
embedded_file_obj0010.bin
c259a88fa7009eac9e74e159f6844afae066e629d097960200bbbe394cbffcee		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x448 149 bytes
embedded_file_obj0011.bin
db600e00a67ac4935cf8b8e271ef99031b9a7be267828702f90367bbe35d8011		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x528 379 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6EE 190 bytes
embedded_file_obj0014.bin
e195409676cbb03ddafb66d371e8285b63f9784cf625f2dc17486f70caed4f5c		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7F9 41133 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA8F0 68 bytes

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