emblem for pdf created by libreoffice

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http://unix.stackexchange.com – If I create a test pdf file in a directory, by using something like ls -al > testpdf.pdf the file is shown in Caja 1.4.0 with an understandable emblem that is 'acrobat-like'. If I create a libreoffice document in Writer and export it to pdf in the same directory, its emblem is a grey 'sheet of text' which makes it very hard to spot. How can I change the icon/emblem used by pdfs created by libreoffice? Can I just overwrite the file used somewhere in /usr/shr/icons ? If so, will it be overwritten by the next libreoffice update? (HowTos)