Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c42df89de59b3e…

MALICIOUS

PDF

6.8 KB
MD5: c5f712cb14dac153611322064e2f992a SHA-1: 8b843c723889baae9948a20c9f0b8b7cc443de69 SHA-256: d2c42df89de59b3eebe5f8a5fc8fe16ba844b5c8e7d0a069734fdc4733f58117
94 Risk Score

Malware Insights

The PDF file contains embedded JavaScript that exploits CVE-2014-0496 via app.addToolButton/removeToolButton. The JavaScript is further obfuscated and decoded using base26, indicating a downloader or initial execution stage. The primary attack vector is likely a user opening a malicious PDF attachment. The specific payload and ultimate goal are not fully discernible 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
da63ba8ccec67132dbc29e91f171c814c7b6dbbb61ff007302527dee492e77ad		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15560 bytes
base26_stage_000.js
02b444889b36c79ad194f0cf5b4bcbaa214685d91736d255e87e148994c535b1		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5925 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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