Alright, I found a solution. It seems that the problem comes from Automate-PDF Presentation… When I use this tool to create my pdf, the shapes are deformed.
But if I export every pages separately in PDF format using Save As… there is no problem.
Then to merge all the pages I use an online webservice.
I agree that this is not really an explanation but more a workaround.
Source : Link , Question Author : MaT , Answer Author : MaT