Remove .docx from signed document file name

When I send out an envelope with a Word document attached that has a .docx file extension, the final signed document comes back with .docx.pdf on the file name.  It would be great if the final file name stripped out the .docx and created a final document with only the .pdf extension.  Currently the only way to fix this is to upload the Word document, and then re-name it to remove the .docx before it is sent.  This is painful - especially when I’m sending many documents in the envelope.