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"

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

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

Doing some other testing, noticed it happens on certain folders, but not others (checked permissions, they are all the same).  Updating to the newest version of 6.5 which I believe uses the ajax uploader for document and image uploads.  Will see if that works and takes care of the issue.