Hide a typo letter in an image in a pdf file generated by LaTeX

I have a typo legend in an image in my pdf file generated by LaTeX. There is an extra "t" at the end of the legend. Unfortunately, I cannot reproduce the correct image. How can I remove that "t" in my pdf?

BTW, I have the correct legend generated by MATLAB (see below). Can I somehow replace the wrong legend with correct one through LaTeX?

• You have more than just one typo there... – Werner Jan 28 '19 at 3:02
• Essentially this is the same as Drawing on an image with TikZ (duplicate). – Werner Jan 28 '19 at 3:03
• Estimated... not Estiamated. If you have "the correct" legend, why not just recreate the image entirely? – Werner Jan 28 '19 at 3:06
• Follow the instructions in the linked post to put a node onto the imported image and then place the graphics into that node like you normally would \includegraphics[..]{new_legend}. – Werner Jan 28 '19 at 3:15
• What sometimes works is to convert the pdf to an eps file, look for the string there. correct it, and convert back to pdf. – user121799 Jan 28 '19 at 3:17

Adobe Acrobat (not the reader, but Pro) allows modifying elements in a pdf quite nicely. However it's a proprietary software.

For a LaTeX hack, I would have tried it this way:

\documentclass{standalone}
\usepackage{graphicx}
\begin{document}
\includegraphics[width = 3in]{figure}%
\hspace{-1.43in}%
\raisebox{2.1in}{%
\includegraphics[width = 1.31in]{legend}%
\hspace{0.1in}}
\end{document}