Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c599cac9e22e06…

MALICIOUS

PDF

6.7 KB
MD5: a83de385c1eddc0fa5c0eb3f53339ad9 SHA-1: b6114e14ae49b14e60ed3f15663d2c3ffc1a2bd8 SHA-256: e9c599cac9e22e06dbce75c93332b638a2199cfb53e56a9023d443d685a2cc81
94 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript that exploits CVE-2014-0496 via app.addToolButton/removeToolButton. The JavaScript is further obfuscated and decoded using a base26 scheme, indicating an attempt to conceal its malicious actions. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the nature of the exploit.

Heuristics 7

  • app.addToolButton/removeToolButton — CVE-2014-0496 critical CVE exact CVE_2014_0496
    PDF JavaScript combines app.addToolButton() and app.removeToolButton() with heap-spray shellcode markers — the public Adobe Reader/Acrobat ToolButton use-after-free exploit shape for CVE-2014-0496. (identified after JavaScript deobfuscation)
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Suspicious extracted artifact info 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.
  • 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/2.8/
    • http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0003_000.js
45ef3d6bb98fa0ec1086ee528e1c9df2344cc91b4cdbb20c2c0e1e500a6c286f		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15440 bytes
base26_stage_000.js
d290126a42f4ba48d31f52082c2e03b1edd8ce203f8a87c4e4aa75f1cb0bd03e		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5877 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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