Your PDF probably doesn't contain spacing characters. Note that it is possible to draw individual text run at any offset in this format.
The OCR technology is a good approach to "recreate" such missing information. You can easily do that using GdPicture by rasterizing the PDF page to a bitmap first, then running OCR using the GdPictureOCR method.
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ORPALIS produces document imaging software for developers and general public. ORPALIS maintains the comprehensive document imaging toolkit series released under the brand "GdPicture", which is now a worldwide known and respected leader in imaging technologies...more