Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9af3559b1c7f1cc…

MALICIOUS

PDF

6.8 KB
MD5: 3100c86e64c6843ff82cebebcd64819a SHA-1: 6edd6d0091a2848118357b2d17e6ee57dd09627f SHA-256: d9af3559b1c7f1cce69f5cfe8b4337b37fb6d025de2d2d6bad21b443dd76e002
96 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 obfuscated and decodes a base-26 encoded string which is then evaluated. This stage is likely responsible for downloading and executing a second-stage payload, indicated by the 'base26_stage_000.js' artifact. The presence of XFA forms and AcroForm buttons further supports the exploitation vector.

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
cf89f9e0ccc463ccb130589ad1ecd22ba055e75d1aa89983c009b9fe893f406b		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15650 bytes
base26_stage_000.js
ce787d9ee5e6d38ca6cafac300a9fe1acca8de1e56b062b285049ee8f4cc619b		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5961 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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