Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f53aa9ebe040c96…

MALICIOUS

PDF

42.4 KB
MD5: da151e6bc39bb9f5a2e031583b93e9ca SHA-1: 5f5c37fba7354b3fbc0a7af25a27b7bb165ab571 SHA-256: 2f53aa9ebe040c9630f08ec1dccd5ee2a7182a683496fdd0a14272aadfc66d19
226 Risk Score

Malware Insights

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

This PDF file was flagged by multiple high-severity heuristics, including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Exploit.Agent-36830. The presence of XFA forms with executable scripts indicates an attempt to exploit PDF reader vulnerabilities. The embedded script payload is the primary mechanism for delivering the malicious payload.

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
53bcb194998502f8aeb03a9d99650c69776f8bc04a23c539ca51c8947124cc33		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 685 bytes
embedded_file_obj0010.bin
b9dc770324ae2a66fd1d9c8b9605e3a9ddaae9d1311dffe002d37a59fdc6e4bc		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x445 183 bytes
embedded_file_obj0011.bin
20582d095205f162995c2a907b672e9f27beb9bfa0be04f9059fb74e33ab48a9		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x547 355 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F5 190 bytes
embedded_file_obj0014.bin
f106305692d1b9a949eeb9273a4612436106bf89fd5b2d9e58ea5d5b7d579250		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x800 40602 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 0xA6E4 68 bytes

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