Google-script; Conversion from the format application / octet-stream to application / pdf is not supported - pdf

Question

I have a similar error to ERROR Get pdf-attachments from Gmail as text but it doesn't work in my case. Drive API's enable. Document has the extension .pdf.
This script works for other documents (also pdf).
Read pdf as text is from Get pdf-attachments from Gmail as text
Please help.
This is my code:
function searchEmails() {
var threads = GmailApp.search('in:inbox newer_than:6d');
if (threads.length > 0) {
for (var t=threads.length-1; t>=0; t--) {
var thread = threads[t];
var message = thread.getMessages()[0];
var from = message.getFrom();
var subject = message.getSubject();
var to = message.getTo();
var date = message.getDate();
var body = message.getBody();
var attachments = message.getAttachments();
if (subject == 'subject') {
Messages(message)
}
}
}
}
function Messages(message) {
var attachments = message.getAttachments();
var blob = attachments[0].getAs(MimeType.PDF);
var body = message.getBody();
var filetext = pdfToText(blob);
filetext = filetext.substr(filetext.search("Title:"));
filetext = filetext.split(' ');
var msgValue = filetext[12];
var msgDate = filetext[6];
var msgID = message.getId();
// rest of my code
function pdfToText (blob, options) {
options = options || {};
var parents = [];
if (options.path) {
parents.push(getDriveFolderFromPath(options.path));
}
var pdfName = blob.getName();
var resource = {
title: pdfName,
mimeType: blob.getContentType(),
parents: parents
};
// Save PDF as GDOC
resource.title = pdfName.replace(/pdf$/, 'gdoc');
var insertOpts = {
ocr: true,
ocrLanguage: options.ocrLanguage || 'pl'
}
var gdocFile = Drive.Files.insert(resource, blob, insertOpts);
// Get text from GDOC
var gdocDoc = DocumentApp.openById(gdocFile.id);
var text = gdocDoc.getBody().getText();
// Delete document.
if (!options.keepGdoc) {
Drive.Files.remove(gdocFile.id);
}
return text;
}
function getDriveFolderFromPath (path) {
return (path || "/").split("/").reduce ( function(prev,current) {
if (prev && current) {
var fldrs = prev.getFoldersByName(current);
return fldrs.hasNext() ? fldrs.next() : null;
}
else {
return current ? null : prev;
}
},DriveApp.getRootFolder());
}

Answer 1

First of all my first code works. However, if there is more than one attachment in email, you will have problems I had originally. Solution below:
function searchEmails() {
var threads = GmailApp.search('in:inbox newer_than:6d');
if (threads.length > 0) {
for (var t=threads.length-1; t>=0; t--) {
var msgs = GmailApp.getMessagesForThreads(threads);   
for (var i = 0 ; i < msgs.length; i++) {   
for (var j = 0; j < msgs[i].length; j++) {     
var attachments = msgs[i][j].getAttachments();               
for (var k = 0; k < attachments.length; k++) {         
var content = attachments[k].getContentType();               
Logger.log(attachments[k].getName()) //check file extension
if (content == 'application/pdf'){
 
/*
you can check if the attachment has the expected name
var attachmentsName = attachments[k].getName();
          if (attachmentsName == 'looking name'){
*/
      var blob = attachments[k].getAs(MimeType.PDF);           
var filetext = pdfToText(blob);           
filetext = filetext.substr(filetext.search("SZCZEGÓŁY"));           
filetext = filetext.split(' ');                       
var msgValue = filetext[14] + filetext[15];           
var msgDate = filetext[6];           
var type = filetext[3];           
// rest of my code
function pdfToText (blob, options) {
options = options || {};
var parents = [];
if (options.path) {
parents.push(getDriveFolderFromPath(options.path));
}
var pdfName = blob.getName();
var resource = {
title: pdfName,
mimeType: blob.getContentType(),
parents: parents
};
// Save PDF as GDOC
resource.title = pdfName.replace(/pdf$/, 'gdoc');
var insertOpts = {
ocr: true,
ocrLanguage: options.ocrLanguage || 'pl'
}
var gdocFile = Drive.Files.insert(resource, blob, insertOpts);
// Get text from GDOC
var gdocDoc = DocumentApp.openById(gdocFile.id);
var text = gdocDoc.getBody().getText();
// Delete document.
if (!options.keepGdoc) {
Drive.Files.remove(gdocFile.id);
}
return text;
}
function getDriveFolderFromPath (path) {
return (path || "/").split("/").reduce ( function(prev,current) {
if (prev && current) {
var fldrs = prev.getFoldersByName(current);
return fldrs.hasNext() ? fldrs.next() : null;
}
else {
return current ? null : prev;
}
},DriveApp.getRootFolder());
}