Malicious PDF — malware analysis report

Static analysis result for SHA-256 df26ffd2bca636de…

MALICIOUS

PDF

6.7 KB
MD5: 5600166d5c89eeda74c40dbe33f6fbd1 SHA-1: c7ccb87deb4d7dfcfd8153b8443f2b7a7f29ebdd SHA-256: df26ffd2bca636de91ce33a62dcfa99ce1c3f80ee19f0a67d12daf22f69a0c32
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that exploits CVE-2014-0496 using 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 malicious intent.

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
392a3020f98b04d7e3570d9035816a8f3cd6793d6c66afd366213070e53cbda9		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15440 bytes
base26_stage_000.js
301c1abdb24c441ede55166f7780f2e6973a887ab34eae3a1a3da4e3dcb32a90		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5877 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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