Malicious PDF — malware analysis report

Static analysis result for SHA-256 114d39590f14a180…

MALICIOUS

PDF

677.5 KB
MD5: 0442001116e289f2f4b5b8b4e170f5ae SHA-1: b36813e6cec1b5ae158aac9f6e0909bdb5e6e843 SHA-256: 114d39590f14a180ccc498a08977c6ef7b1c39d08c2b7d1f8254ffc6b20a8f63
206 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that is obfuscated and appears to be designed to exploit a known vulnerability (CVE-2010-2883) in Adobe Reader. The script's primary function is likely to download and execute a secondary payload from a remote location, indicated by the presence of JavaScript exploit cluster heuristics. The benign URLs extracted are likely unrelated to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier clean score 0.2444

Heuristics 7

  • Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883
    PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
  • 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.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
c4ba3591c3074e8fbc2f51681f2267ae4d6650196a96437268cf3aa864f515e3		 pdf-javascript-stream PDF /JS object 12 at offset 0xA89CD 5835 bytes

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