Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd14d97800f515d7…

MALICIOUS

PDF

6.7 KB
MD5: 06b00526e1e3655e78ffbedf62c3bcf2 SHA-1: 4d4f2cc495a328ea16a54c6404eea91fb4bab402 SHA-256: bd14d97800f515d79325e72b59ff92de4f13aaa72a606de1445f6a80ed2c2ecb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains embedded JavaScript that exploits CVE-2014-0496 via app.addToolButton/removeToolButton. The critical heuristic indicates that the PDF launcher decodes base-26 character pairs, subtracts a constant, and evaluates the result, suggesting it downloads and executes a second-stage payload. The extracted 'base26_stage_000.js' file is a deobfuscated JavaScript stream, further supporting the execution of a malicious script. No specific malware family could be confidently identified.

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
5ad5924dd861cf03e5cbd50e1e1ee4fd126c61534c003516523fb7011ccbf164		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15484 bytes
base26_stage_000.js
e0ebcf441f33077f13d04d18a0b6dd49e2cb92c73d3e509c67dd9cb7e1168938		 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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