Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c95abd5f735d03…

MALICIOUS

PDF

6.8 KB
MD5: 05fa715d7247bb3ce755df43c2d3566d SHA-1: 377e9a4d903e6275dbde1c7079d925fa7e7f1e56 SHA-256: 82c95abd5f735d03ac0c8eeaf47cc2b0c01e5c0e9501b8a6d14af60d8d6f9564
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File Execution: User Execution: Malicious Script

The PDF file contains embedded JavaScript that exploits CVE-2014-0496 using app.addToolButton/removeToolButton. The JavaScript is further obfuscated and decodes a base-26 encoded stage. This stage is responsible for downloading and executing a second-stage payload, indicated by the 'Suspicious extracted artifact' heuristic. The primary attack vector is the exploitation of a known PDF vulnerability.

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
5be9cb1d9c17554eb34620050c5cd1b470fdfbe272c6764e3fd274ab166d192b		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15484 bytes
base26_stage_000.js
d54202d7d0b01844fb9dbb4d2a46719ffb62623d64f89e0007875d49d967e94e		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5895 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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