diff --git a/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.html b/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.html
index 8d4edfc390..defce60eb2 100644
--- a/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.html
+++ b/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.html
@@ -27,7 +27,7 @@
              class="adf-viewer-pdf-viewer"
              (window:resize)="onResize()">
             <div [id]="randomPdfId + '-viewer-viewerPdf'"
-                 class="adf-pdfViewer"
+                 class="adf-pdfViewer pdfViewer"
                  role="document"
                  tabindex="0"
                  aria-expanded="true">
diff --git a/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.ts b/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.ts
index 622685f465..dc59f3a69f 100644
--- a/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.ts
+++ b/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.ts
@@ -114,7 +114,7 @@ export class PdfViewerComponent implements OnChanges, OnDestroy {
     displayPage: number;
     totalPages: number;
     loadingPercent: number;
-    pdfViewer: any;
+    pdfViewer: PDFViewer;
     pdfJsWorkerUrl: string;
     pdfJsWorkerInstance: Worker;
     currentScaleMode: PdfScaleMode = 'init';
@@ -132,7 +132,12 @@ export class PdfViewerComponent implements OnChanges, OnDestroy {
     documentOverflow = false;
 
     get currentScaleText(): string {
-        return this.pdfViewer?.currentScaleValue ? Math.round(this.pdfViewer.currentScaleValue * 100) + '%' : '';
+        const currentScaleValueStr = this.pdfViewer?.currentScaleValue;
+        const scaleNumber = Number(currentScaleValueStr);
+
+        const currentScaleText = scaleNumber ? `${Math.round(scaleNumber * 100)}%` : '';
+
+        return currentScaleText;
     }
 
     private pdfjsLib = inject(PDFJS_MODULE);
@@ -452,10 +457,9 @@ export class PdfViewerComponent implements OnChanges, OnDestroy {
      */
     setScaleUpdatePages(newScale: number) {
         if (this.pdfViewer) {
-            if (!this.isSameScale(this.pdfViewer.currentScaleValue, newScale)) {
-                this.pdfViewer.currentScaleValue = newScale;
+            if (!this.isSameScale(this.pdfViewer.currentScaleValue, newScale.toString())) {
+                this.pdfViewer.currentScaleValue = newScale.toString();
             }
-
             this.pdfViewer.update();
         }
         this.setDocumentOverflow();
@@ -468,7 +472,7 @@ export class PdfViewerComponent implements OnChanges, OnDestroy {
      * @param newScale - new scale page
      * @returns `true` if the scale is the same, otherwise `false`
      */
-    isSameScale(oldScale: number, newScale: number): boolean {
+    isSameScale(oldScale: string, newScale: string): boolean {
         return newScale === oldScale;
     }