Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58d1cb911bbe758…

MALICIOUS

PDF

101.6 KB
MD5: cf4710622d2d083a46a2cb4547fbab83 SHA-1: c37f529d3dea0e4102a4916dfba29c0ce945c852 SHA-256: a58d1cb911bbe7587990a057d85251413d3a79a79137945e3ef727765f75a568
174 Risk Score

Malware Insights

MITRE ATT&CK
T1190 Exploit Public-Facing Application

The file is a PDF that contains embedded JavaScript and is flagged by multiple heuristics, including a critical detection for the CVE-2010-2883 Adobe Reader CoolType SING font exploit. The embedded JavaScript is likely used to download and execute a secondary payload, as indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristic firings. The ML classifier and ClamAV also flagged the file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5833

Heuristics 6

  • 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.
  • 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 0x18A4A 5835 bytes

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