Malicious PDF — malware analysis report

Static analysis result for SHA-256 d379dc5b95954105…

MALICIOUS

PDF

6.8 KB
MD5: 7042f1df557af13e2d5f75ee3474fac6 SHA-1: b852724cc960e6cdd03bbc796a0ca6aae260907e SHA-256: d379dc5b95954105fe4626193232f44397413db81c6876903f5ab685e59741cf
132 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 using app.addToolButton/removeToolButton. The JavaScript is further obfuscated and decodes a base-26 encoded stage. This stage is likely responsible for downloading and executing a second-stage payload, indicated by the 'Suspicious extracted artifact' heuristic. The specific payload and its ultimate destination are not discernible from the provided static analysis.

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)
  • Suspicious extracted artifact high 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.
  • 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
  • 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
7990829b01afc6b60d2442efd5ead44d38d15df09002ae97caeb8f45a29246c2		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15620 bytes
base26_stage_000.js
71ac37f964bea5d7f338e31d171486d1d31c6a2711a38fb9c679cd42cb5e3e65		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5949 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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