Here, i have attached the PDF, that PDF document contains "Nudi" as an embedded font. When i searching the particular word (that in Nudi font), the search result selecting the word that context next to the exact word.

Link to PDF file (or attach file here):
[sample_pdf.zip](https://github.com/mozilla/pdf.js/files/229582/sample_pdf.zip)

Configuration:
- Web browser and its version: Mozilla 45.0.2
- Operating system and its version: Windows 7
- PDF.js version: 1.4.20-disc

What is the expected behavior? (add screenshot)
![find_01](https://cloud.githubusercontent.com/assets/17423938/14704922/c2e67f2c-07d4-11e6-9320-9aed2578d377.png)

/* Copyright 2018 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { setVerbosityLevel, VerbosityLevel } from "../../src/shared/util.js";
import { isNodeJS } from "../../src/shared/is_node.js";
import { PDFNodeStream } from "../../src/display/node_stream.js";
import { setPDFNetworkStreamFactory } from "../../src/display/api.js";
if (!isNodeJS) {
  throw new Error(
    "The `gulp unittestcli` command can only be used in Node.js environments."
  );
}
setVerbosityLevel(VerbosityLevel.ERRORS);
setPDFNetworkStreamFactory(function (params) {
  return new PDFNodeStream(params);
});