Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5e4d1256574f34…

MALICIOUS

PDF

6.7 KB
MD5: c9a3b8e44b5c96b6a97cb24345cd298c SHA-1: ad8ffc89db894a46a6bac1baeee9c82498cc0e9d SHA-256: 3a5e4d1256574f34b8ce065dc4f845672bf037b9a60afb86a32f55e035df55d0
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 via app.addToolButton/removeToolButton. The JavaScript is further obfuscated and decoded using a base26 method, indicating a deliberate attempt to conceal its malicious actions. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact nature of the payload could not be determined from the provided evidence.

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
c699bc9462ab940ee6291a67a162893e212e7209a4dde66a9539418b57eecb41		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15380 bytes
base26_stage_000.js
91ca5c7db101dadc3b57f4c5337fb71393a9b200a5519b84845f26f098b88444		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5853 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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