$ pdf2svg
$ pdftocairo -svg
$ inkscape -l out.svg in.pdf
$ inkscape \
  --without-gui \
  --file=input.pdf \
  --export-plain-svg=output.svg 
$ pstoedit -f plot-svg -dt -ssp eqn.ps eqn.svg

Fonts don’t match

An option seems to be to first convert the fonts to path on the pdf side with:

$ gs -o target.pdf -dNoOutputFonts -sDEVICE=pdfwrite source.pdf

Q&A

Convert PDF to SVG by command line
convert pdf to svg
PDF to SVG conversion with grouping and proper text conversion
Convert PDF to clean SVG?
pdf2svg