I have tried to replace the pdfjs version of Share (Alfresco Share 6.2 in my case) with a newer one but it seems that it is not easy, at least for me. Has anyone else had this issue? From what I've seen, it also happens in Alfresco Share 7.0
I upgraded pdfjs to 2.6.347 for a customer on ACS 6.2 earlier this year due to broken PDF rendering on some browsers for some types of PDF files. Due to Aikau and some config / API changes in pdfjs, you also need to adapt the PdfJs.js file in Share's /components/preview/ static resource path. My customisation did not directly update the pdfjs version included with Aikau, which should probably done if you also want previews in the faceted search result screen to work properly (not really relevant for the customer's case).
Ok, thanks, Axel. Anyway, we have tried it with version 2.5.7 (the one that Alfresco 7 uses) and it also fails in the latest version of Chrome. And reading the post that I linked, it seems that it also fails in 2.6.347. I guess we will have to try to migrate to 2.9.359 manually.