I'm sending a PDF file as multipart/form-data and when I click download, for some reason it saves it as a .bin. The contents look like a PDF but also happen to have the following at the start:

--b4baaa6a-3ea0-4490-9026-e81849d841d2
Content-Type: application/pdf
Content-Disposition: form-data; name="document"; filename="01234567891011_Confirmation_Signed.pdf"; filename*=utf-8''01234567891011_Confirmation_Signed.pdf

And this at the end:

--b4baaa6a-3ea0-4490-9026-e81849d841d2--

Even after removing those parts, the PDF cannot be opened. File attached as a .txt because it wouldn't let me upload a .bin.

Am I missing something here?

3a8e6dfa-2c93-4f67-af74-dc485f091998.txt