More specifically from "http://krishikosh.egranth.ac.in" it is a repository of Thesis. Previously IDM was able to capture all the pdf requests but now some Coding has been changed and its inaccessible now. Upon reaching to the network tab it does show it as a XHR file under pdf.worker.js.
Here is a trial link
http://krishikosh.egranth.ac.in/displaybitstream?handle=1/5810062295
Please Help.