activate pdfJs, fallback on swf files for <=IE8
activate pdfJs, fallback on swf files for <=IE8

lostdalek/embed-bundle,alchemy-fr/embed-bundle,lostdalek/embed-bundle,alchemy-fr/embed-bundle,lostdalek/embed-bundle,alchemy-fr/embed-bundle,alchemy-fr/embed-bundle,lostdalek/embed-bundle