Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6366dc28422efb…

MALICIOUS

PDF

6.8 KB
MD5: 45f70e1c30d4797917cfd2bf9e6e8848 SHA-1: 5c67cf433834fed4d6e5280d3964444791addcd2 SHA-256: 4d6366dc28422efbb337ac87b0205e72b855850ce997e5efbb743b4a9de66e1a
132 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2014-0496, as indicated by the 'app.addToolButton/removeToolButton' heuristic. The JavaScript is further obfuscated and decoded from base26, suggesting it's a downloader for a second-stage payload. The presence of XFA forms and AcroForm buttons with actions are common delivery mechanisms for such exploits. No specific family could be identified.

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
a0a4dd10cf8f23dd8487fabe036bcdcdac8b817d438e9daa8bc7769e443b07c1		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15500 bytes
base26_stage_000.js
bca063395ac8bf544bbb83e77e8b53a9a30d5e5d36030b40aa346d0df07deb33		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5901 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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