You can specify color management options for exporting files to PDF. You can choose a color profile or leave the objects in their original color space. You can also embed the color profile with the PDF.
If you have spot colors in your file, you can either preserve the spot colors or convert them to process colors so that the file produces four plates for CMYK output.
If you want to export to PDF for the purpose of soft-proofing the document, you can apply the document’s color proofing settings. In addition, you can choose additional soft-proofing options, such as preserving document overprints and overprinting black.
If you choose the Native option from the Output color list box, a maximum of three color spaces are displayed, or embedded, in the PDF file.