<drilldown>
<condition field="pdf_url">
<link target="_blank">$click.value2|n$</link>
</condition>
</drilldown>
For color formatting:
<format type="color" field="pdf_state">
<colorPalette type="expression">case (like(value,"accepted"), "#037FFC", like(value,"denied"), "#FC030F", like(value,"pending"), "#FFFF00")</colorPalette>
</format>
this worked.thank you
<drilldown>
<condition field="pdf_url">
<link target="_blank">$click.value2|n$</link>
</condition>
</drilldown>