The scan is not really a good one. The letters are kinda blurry, the pages are scanned crooked (sometimes tilted to the left, sometimes tilted to the right) and it's not OCR'ed at all. So no way to search within the file.

File properties tell "Creator: FUJITSU fi-5110Cdj" and "Producer: PDFScanLib v1.2.2 in Adobe Acrobat 9.3.2 / PDF PT 3.10 (pdf-tools.com) / PDF PT 3.10 (pdf-tools.com) / PDF PT 3.10 (pdf-tools.com)"