Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f02cc15f0bfdd1…

MALICIOUS

PDF

6.8 KB
MD5: 44c37fdc926668edacb3d0361a7bb032 SHA-1: c13cdf4ab6233d5d86d6a13c177564bb7df3a15e SHA-256: d8f02cc15f0bfdd1a608cce8496cbfbe127a51599a2e3412baf7996c2a7f6bbb
132 Risk Score

Malware Insights

The PDF file contains embedded JavaScript that exploits CVE-2014-0496. The critical heuristic indicates that the PDF launcher decodes base-26 character pairs, subtracts a constant, and evaluates the result, suggesting it's designed to download and execute a second-stage payload. The deobfuscated JavaScript file, base26_stage_000.js, further supports this by containing obfuscated code likely responsible for the payload execution.

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
84fafcc903ee3a6eefc2f4128e5f3c8fe7b8c7f078d8eaa881c6501b7041b232		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15484 bytes
base26_stage_000.js
f41b1e04a89de3a36a37f781ae01e5116a1c821c41ec008c1d8b19f1dcc4c0bc		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5895 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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