Malicious PDF — malware analysis report

Static analysis result for SHA-256 732ecc023e895448…

MALICIOUS

PDF

7.8 KB
MD5: b52b42e0ae1cd2203231d78a56fe9d25 SHA-1: 4328e5c77b513ea76f8f5786b20b94d39e542dc9 SHA-256: 732ecc023e895448097102aa06187d6613bafd9307c28a29be5c2e6b7f9507a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating an attempt to obfuscate malicious code execution. This JavaScript is likely designed to download and execute a secondary payload, a common technique for PDF-based malware. The ML classifier strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9205

Heuristics 6

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0024_00.bin
7a5d63477e1e719b2dbe17fd1004881cbdf2d9cc30dad8117104644ef579063a		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 380 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.