[Tex/LaTex] pdflatex tex issue with section which contains underscore

bookmarkscharacters

I have a tex file which is like this :

  \cleardoublepage
    \phantomsection
    \includepdf[pages=-,addtotoc={ 1,section,1, 200_project_title: , p1,
        1,subsection,1,Section A - Project Identification, p2,
        1,subsection,1,Section C - Basic or Applied Research,p3,
        3,subsection,1,Section D - Additional project information,p4
        }]{fixed_2010_2.pdf}

pdflatex fails to compile wherever there is undercore in section title

e.g  200_project_title:

It would be great if someone help me fine out a better way to pass section title without escaping those underscore and possibility handling other special characters which might mess up with compilation

thanks

EDIT: using
\begingroup \catcode'\_=12 \tableofcontents \endgroup
screenshot

EDIT: using
in preamble : \usepackage[T1]{fontenc}
and for table of contents
\begingroup \catcode'\_=12 \tableofcontents \endgroup

screenshot 2

Working one after you kind suggestions and answers:
This working now for me (do not know any hazards yet) thank you for all your suggestions:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{pdfpages}
\usepackage[
  pdfpagelabels=true,
  pdftitle={Report Title},
  pdfauthor={sakhunzai},
]{hyperref}
\usepackage[T1]{fontenc}

\hypersetup{
    colorlinks=true, 
        linkcolor=blue
}

\begin{document}
\catcode`\_=12

\cleardoublepage
\pdfbookmark{\contentsname}{toc}
\pagenumbering{roman}
\tableofcontents 

\cleardoublepage
\phantomsection
\includepdf[pages=-,addtotoc={ 1,section,1, 200_project_title: , p1,
        1,subsection,1,Section A - Project Identification, p2,
        1,subsection,1,Section C - Basic or Applied Research,p3,
        3,subsection,1,Section D - Additional project information,p4
        }]{fixed_2010_2.pdf}
 \end{document}

Best Answer

If you want to avoid using \_ for underscore you need to make it an ordinary character and use a font encoding that supports it so add

 \usepackage[T1]{fontenc}

to the preamble and then include the table of contents file the includes underscores with

\begingroup \catcode'\_=12 \tableofcontents \endgroup

If for some reason you are committed to OT1 fonts and still want to avoid quoting _ then you could instead use

\begingroup \catcode'\_=13 \def_{\_} \tableofcontents \endgroup
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