The following javascript code will retrieve the raw tx data for transaction id 54e48e5f5c656b26c3bca14a8c95aa583d07ebe84dde3b7dd4a78f4e4186e713 
  and convert it into a downloadable PDF document inside of the browser. 

  I would recommended changing the source for downloading the raw transaction data from your own node or source.
  Examples include:
  .then(response => response.text())
  .then(data => {
    var s = data.split("0100000000000000");
    var lines = [];
    for (var i = 1; i < s.length; i++) {
      lines.push([s[i].slice(6,136),  s[i].slice(138,268), s[i].slice(270,400)].join(''));
    var pdfString = lines.join('').slice(16,-20);
    var a = document.createElement("a");
    a.href = "data:application/pdf;base64,"+btoa(pdfString.match(/\w{2}/g).map(function(a){return String.fromCharCode(parseInt(a, 16));} ).join("")); = "Bitcoin.pdf";;