• http://coolwanglu.github.io/pdf2htmlEX/ - open-source, looks good but I've not tested for tabular data
• http://tabula.nerdpower.org/ - open-source, designed specifically for tabular data but looks a bit of a pain to set up
• http://pdftoxml.sourceforge.net/ - one of the better for tables but have not used for a whiole
• http://pdftohtml.sourceforge.net/ - linux only afaict
• pdf.js - you probably want a fork like pdf2json or node-pdfreader that integrates this better with node. I have not tried this on tables though ...

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