Consider the following MWE:
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Code, edit and compile here:
\documentclass{article}\usepackage[T1]{fontenc}\usepackage[bookmarks=true]{hyperref}\begin{document}\section{$\chi^{2}$ Test}Something.\end{document}
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Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):(hyperref) removing `math shift' on input line 8.Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):(hyperref) removing `\chi' on input line 8.Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):(hyperref) removing `superscript' on input line 8.Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):(hyperref)
Thank you in advance!