Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b5c138225f9f2c…

MALICIOUS

PDF

6.8 KB
MD5: 4e7cba75b90929ef0975012e16a7dd52 SHA-1: f63ce1ca499ce055ccecfcb7d8f39ff758a9d17a SHA-256: d4b5c138225f9f2cfe3ae1fe995683b053d224df0476ff21f4ff275084e825ed
132 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF document contains embedded JavaScript that exploits CVE-2014-0496 using app.addToolButton/removeToolButton. The embedded JavaScript is further obfuscated and decodes a base26-encoded second stage. This second stage is responsible for the malicious execution, likely downloading and running additional payloads. The primary IOC is the CVE identifier itself, as the exploit is directly referenced.

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
43a306807361f3097ba224ae55f73275963f722d6d11748462f329c768aa811a		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15650 bytes
base26_stage_000.js
bbb55c2f37cb5989a6184b0dc327d3822abe0b3e81f6dd4bd9fdfefe22c6d0af		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5961 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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