Malicious PDF — malware analysis report

Static analysis result for SHA-256 516c7fc584459e4b…

MALICIOUS

PDF

6.7 KB
MD5: 152af692ff578ec821b71bea8071975e SHA-1: a5dc6583a40d21bf94ca5723bcd4f04307f7d10a SHA-256: 516c7fc584459e4b836f5576ad0ae2d8e300449b6882789f14a958a3dc46f851
94 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 via app.addToolButton/removeToolButton. The heuristic indicates that the JavaScript is base26-decoded and further encoded, suggesting it acts as a downloader for a second-stage payload. The extracted 'base26_stage_000.js' file is likely this deobfuscated payload. The attack pattern is thus a malicious PDF leveraging a known vulnerability to execute arbitrary code.

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
01055cdc1d62263ee9a8ef388b67308823ce7676e05f66fedd87afa9cf1a164b		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15424 bytes
base26_stage_000.js
f8494110866ff40fbcbb7d06003b6597bd89b598c29548b282647e05f993b449		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5871 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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