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Here are the steps to obtain a PDF file within a Shiny application:

1. Create a download button - Use the downloadButton function provided by Shiny to create a button that users can click to download the PDF file.

2. Create a function to generate the PDF file - You will need to write a function that generates the PDF file. This function can use any R package that can create PDFs, such as Rmarkdown or knitr.

3. Add the PDF generation function as an event to the download button - You can use the observeEvent function to add the PDF generation function as an event to the download button.

4. Render the download button - Use the renderUI function to render the download button in the UI portion of your Shiny application.

5. Save the PDF file to a temporary directory - The PDF file needs to be saved to a temporary directory before it can be downloaded. You can use the tempfile function to create a temporary file name and the file.copy function to save the PDF to that temporary file.

6. Download the PDF file - When the user clicks the download button, the PDF file should be downloaded to their computer. You can use the downloadHandler function to create a custom download handler that initiates the download when the download button is clicked.

7. Clean up temporary files - Finally, it's a good idea to clean up any temporary files that were created during the PDF generation process. You can use the unlink function to delete temporary files after they have been downloaded.