var text = 'SOC 01 672 1.653.806,08 18.512,98 1.667.621,57 2.647,38 07 23 12.965,11 0,00 12.965,11 0,00 13 5 10.517,81 0,00 10.517,81 0,00';
var reg  = new RegExp('SOC 01' +  '\b.*?(?:\d\S*\s+){3}(\d\S*)', 'i');
var reg2 = new RegExp('SOC 01' +  '\b.*?(?:\d\S*\s+){7}(\d\S*)', 'i');
var match = reg.exec(text);
var match2 = reg2.exec(text);

match[1] -> '1.667.621.57'
match2[1] -> '12.965.11'

(+match[1]) + (+match2[1])

output: NaN