So, I came across this: https://stackoverflow.com/questions/9809001/is-there-a-way-to-combine-pdfs-in-pdf-js
And upon digging into it a little more, it seems like it is pulling the data from each page and spitting it out as separate pages. I wondered if one can actually use pdf.js's default viewer to achieve a similar result. The default viewer is quite comprehensive, so if someone can confirm a yes or no that it will work or not, that will be great. Code samples or a guide would also be helpful if this actually is easily possible (writing a new viewer is not).
If pdf.js cannot be used to achieve this result, are there any other alternatives for merging two pdf files and displaying them as one via a browser?