Malicious PDF — malware analysis report

Static analysis result for SHA-256 631bc9fec20e16e8…

MALICIOUS

PDF

42.3 KB
MD5: e3838f741e79c5ce2434f914672a42ce SHA-1: 350f9044290fd8cc22450e12234555213c4cd768 SHA-256: 631bc9fec20e16e831e2e942badf86fd387ff914e2729daa8a3d5cdff0d534c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF identified as malicious by ClamAV and an ML classifier, indicating exploitation. It contains embedded script content, likely JavaScript given the PDF context, which is designed to execute arbitrary code. The embedded script is obfuscated, but the presence of PDF exploit signatures suggests it attempts to leverage a vulnerability for initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
433f8037f9faf371ae8406e0af2fe59d8d14f8ed7111e352f680c6ea9733dde6		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42543 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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