Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b81d80366e1482d…

MALICIOUS

PDF

6.7 KB
MD5: a4f8ef91a783ef8a3248a3022bb73c11 SHA-1: 2ff61dd8a94137d1ce6f52efe988d0622776988e SHA-256: 3b81d80366e1482d9554af3e246acabd333cf7df2531193788f38eef67e8958f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits CVE-2014-0496, a vulnerability in Adobe Reader related to app.addToolButton/removeToolButton functionality. The exploit decodes base-26 encoded JavaScript, which likely serves as a second-stage payload. The specific intent of the decoded payload is not fully clear due to obfuscation, but the exploit itself is a strong indicator of malicious activity.

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
e1fb2be2792348bb9d20139b492dde76ee5da3f89502ea7526f6ae8ef1a5d5a9		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15424 bytes
base26_stage_000.js
829e0da4860cf39eacc17e1e674a5a63ca6824e2f5ae9a747291532ce69b152e		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5871 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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