This happens on not-properly-produced .pdf files, with custom encodings
but without cmap (toUnicode) entries. Unfortunately, there are a lot of
them out there!

When selecting text, evince (erroneously) displays the characters that
will be copied to the clipboard, instead of the original glyphs.

Explanation: There is a PDF specification "feature", where one can
declare that the character 'A' maps to the glyph 'B'. So if 'A' is
written in a pdf text object, it displays as 'B' but it gets copied as
'A'!

My English is poor, so I made a ***minimal*** .pdf that reproduces this
bug.

If you open it in Evince and select all the text, the line that contains
BCDΓ
should display 
ABC<display artifact>
when selected!

Kind regards,
Alkis Georgopoulos

** Attachment added: "evincebug.pdf"
   http://launchpadlibrarian.net/16578432/evincebug.pdf

-- 
characters change when selecting text
https://bugs.launchpad.net/bugs/39890
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