Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db8c18ab7cfcc58…

MALICIOUS

PDF

6.8 KB
MD5: cc396124cfc13e35369dee0a08770701 SHA-1: 640ecdde8bbcb7a576b916b942d394b23eeb8580 SHA-256: 4db8c18ab7cfcc5802fafcdd47fe1dc10bd4cf8c0b16da85605881b8cd9a04ac
94 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2014-0496 vulnerability (app.addToolButton/removeToolButton). This script is further obfuscated and appears to be a downloader for a second-stage payload, as indicated by the 'base26_stage_000.js' artifact. The primary intent is to execute arbitrary code by exploiting this known PDF vulnerability.

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
87a502c8f756cda4ed7ce29a7745b2ba19a24c49338228d697d276fb01e31850		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15560 bytes
base26_stage_000.js
52578a5e64a641b7b2694a19b1473b0efbaa65e229b3e4d73269040077b660c6		 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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