Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac5be333417c2dd…

MALICIOUS

PDF

34.3 KB Created: 2010-10-16 15:03:49
MD5: 11eb919d3b67787708bc7afa1cc8caa4 SHA-1: 2e8b89b023626f1e39d82c150272d030ff387f59 SHA-256: 0ac5be333417c2dd6edf291d1f411882ba50bba8c183344d72cdb0b8cd2f3768
136 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, flagged by multiple heuristics as a potential exploit. The JavaScript stream, though short, contains a string that may be part of a larger obfuscated payload. The presence of XFA form elements and JavaScript actions strongly suggests an attempt to exploit PDF viewer vulnerabilities for code execution, likely to download and run a second-stage malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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_obj0043_000.js
fd5f245700c5c2da5cce9ccd537c4c61fe087a1c6e1ea584b4d8cd730e3511a4		 pdf-javascript-stream PDF /JS object 43 at offset 0x68B2 45 bytes

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