Malicious PDF — malware analysis report

Static analysis result for SHA-256 044a64c863a66060…

MALICIOUS

PDF

41.1 KB Created: 2010-05-04 08:37:44 +08:00 Authoring application: Acrobat Web Capture 7.0
MD5: b70985e85b891b9d51748a37e86d9b3c SHA-1: af24e34e7adf6f575d0824fbf4151d3a75c6cb48 SHA-256: 044a64c863a6606028725c6e2aec6afe1323143233e7fc015d6650ffb2683321
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

This PDF file contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() functions. The script is designed to decode and execute a secondary payload, likely a downloader or dropper, based on the critical PDF_JS_EXPLOIT_CLUSTER heuristic. The embedded JavaScript file 'javascript_obj0037_000.js' is the primary artifact of interest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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)
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.
  • 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.
  • 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
javascript_obj0037_000.js
e93f32651195259b64d1a1cedc9097e7cb099d84a8994f3b6627e13d7782b193		 pdf-javascript-stream PDF /JS object 37 at offset 0xA35 16095 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 14 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s). Carved artifact contains 6 long hex-escaped blob(s).

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