One more thing-a colleague recently recommended this tool: If it's the latter, you may just end up have better luck digitizing the lines you need. dwg was first printed out and later run through a scanner), then it very likely is rendered just as a raster in the PDF, making extraction of vector linework more difficult without a little intermediate raster feature extraction/classification as part of the process. However, if creation of the PDF involved a scan of a paper plan (like if the CAD. If this is the case, the vector linework is it's own layer in the PDF and one of the above tools should work great. It's worth noting that some PDFs retain the actual vector linework of a CAD drawing (.dwg) depending on how the PDF was generated. dwg and I then use the Spatial Adjustment tools in ArcMap to extract the geometry I want for output to either.
While these are outside of the Esri suite, in the past I've had luck with either CADSoftTools ( ) or easyPDF ( ) to go from PDF to.
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