We have already logged a similar issue “The unwanted characters being returned during text extraction from PDF” and the fix for the reported problem is planned to include in our upcoming weekly NuGet release, which will be available on March 14th, 2023.
Please use the below feedback link to track the status of the reported bug.
https://www.syncfusion.com/feedback/41795/the-unwanted-characters-being-returned-during-text-extraction-from-pdf
If the issue persists after referring to the NuGet, it is possible that it may be related to the specific PDF document. To assist you further, we kindly request that you share the input document with us
Note: If you require a patch for the reported issue in any of our Essential Studio Main or SP release versions, then kindly let us know the version, so that we can provide a patch in that version based on our SLA policy.
Disclaimer: “Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.”