Nothing strange, I have a small script to cleanup pdfs in general (reducing their size as well), essentially pdftops -paper A4 -expand -level3 file.pdf ps

Nothing strange, I have a small script to cleanup pdfs in general (reducing their size as well), essentially pdftops -paper A4 -expand -level3 file.pdf ps2pdf14 -dEmbedAllFonts=true \ -dUseFlateCompression=true \ -dOptimize=true \ -dProcessColorModel=/DeviceRGB \ -r72 \ -dDownsampleGrayImages=true \ -dGrayImageResolution=150 \ -dAutoFilterGrayImages=false \ -dGrayImageDownsampleType=/Bicubic \ -dDownsampleMonoImages=true \ -dMonoImageResolution=150 \ -dMonoImageDownsampleType=/Subsample \ -dDownsampleColorImages=true \ -dColorImageResolution=150 \ -dAutoFilterColorImages=false \ -dColorImageDownsampleType=/Bicubic \ -dPDFSETTINGS=/ebook \ -dNOSAFER \ -dALLOWPSTRANSPARENCY \ -dShowAnnots=false \ file.pdf file.pdf that's is. After if needed we can add extra metadata. It's not specially designed to remove certain kind of tracking but simple and useful enough in most cases.