PDFs that were created with bitmap (raster) software (Photoshop, etc) typically contain instructions like make pixel 3 of row 2 red, make pixel 4 through 29 or row 5 blue. Data like this is relatively easily converted into a DWG/DXF/ VWX file format. That means the file is basically a list of directions like draw a line from 0,0 to 100,120, Draw a curve from 100,120 to 120,200, etc. PDFs that were created from a vector based program (like a CAD program or Adobe Illustrator) typically contain vector data. The biggest issue is how the PDF was originally created.
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