Strange problem here, and I don't think it has to do with the editor.  It happens on my production server but not on my development server.  When I upload a PDF file using the document upload feature of the editor, "Content-Disposition: form-data; name="__EVENTTARGET" and other like items are added at the end of the PDF (past the %%EOF) which renders the pdf corrupted.

 

No idea why this would be happening.  The full text appended to the pdf is found below.

 

-----------------------------7d97f10a03c6
Content-Disposition: form-data; name="__EVENTTARGET"

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Content-Disposition: form-data; name="__EVENTARGUMENT"

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Content-Disposition: form-data; name="__VIEWSTATE"