pdf-js preview error

[hdezela]

Whenever I try to preview any document (using 7.8.3), pdf-js throws the following error:

pdfjs-dist/build/pdf.combined.js:formatted:8695
    Error: Invalid XRef stream header

pdfjs-dist/build/pdf.combined.js:formatted:8696
    at f (pdfjs-dist/build/pdf.combined.js:7:11095)
    at a.readXRef (pdfjs-dist/build/pdf.combined.js:18:20226)
    at a.parse (pdfjs-dist/build/pdf.combined.js:18:15671)
    at a.setup (pdfjs-dist/build/pdf.combined.js:28:30792)
    at a.parse (pdfjs-dist/build/pdf.combined.js:28:29399)
    at eval (pdfjs-dist/build/pdf.combined.js:30:1421)
    at a.ensure (pdfjs-dist/build/pdf.combined.js:30:1353)
    at a.ensureDoc (pdfjs-dist/build/pdf.combined.js:30:383)
    at eval (pdfjs-dist/build/pdf.combined.js:30:5057)

io.ox/core/viewer/views/types/documentview.js:formatted:278
    Core.Viewer.DocumentView.show(): failed loading PDF document. Cause:  filterError
    i	@	io.ox/core/viewer/views/types/documentview.js:formatted:278
    c	@	io.ox/core/viewer/views/types/documentview.js:formatted:247
    (anonymous)	@	boot.js:3257
    k	@	boot.js:3100
    fireWith	@	boot.js:3212
    e.(anonymous function)	@	boot.js:3302
    (anonymous)	@	io.ox/core/pdf/pdfdocument.js:2
    k	@	boot.js:3100
    fireWith	@	boot.js:3212
    c	@	boot.js:8267
    (anonymous)	@	boot.js:8606

According to the pdf-js devs, this is a format error in the PDF file being fed into it, is there a way to fix this from my end or is it something internal?

[hdezela]

I can see that this is apparently due to the documentconverter not being installed. Is there any way to confirm that this is the case?