Don't think this is limited to pdf files, as I'm having trouble downloading csv files. I've never seen this happen -- this issue started last week. Also, it's only with a certain server. When I test using my own server, I don't have any issues.
I attached my original and downloaded files. Issues start at line 5873. Basically, the chunk from a few lines up repeats itself. Then there's a line break, then the file resumes. But the issue happens a few times in the course of the file. I attached zips of the files (although they were transferred as .csv, using binary mode) and the log. I removed some information from the log, but if you want the original I can private message it.
Other SFTP clients d/l these files correctly.
Hopefully this helps -- let me know if you need any other info. Thank you.
sftptest.zip (519.46 KB, Private file)