PPT changing color while converting to PDF

I am converting PPT to PDF using Unoconv on my Ubuntu 14.04 server. Most of the files are being converted correctly, except few files. After conversion, the color of the slide becomes very bright. When I open the PPTx in “Microsoft Office PowerPoint” it appears correct, but when I open the same PPTx in “OpenOffice Impress” it appears same very bright color as it was after conversion. It may be CMYK to RGB issue but I am not sure.

Command I am using to convert PPT to PDF is:
unoconv -f pdf PPT_File_Name


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Source PPTx file: norton.pptx - Google Drive

Isn’t there a way to fix this?