Malicious PDF — malware analysis report

Static analysis result for SHA-256 a027ffb25f8cbe97…

MALICIOUS

PDF

6.7 KB
MD5: 50a1dfc16f0406ed713af46ccb222e57 SHA-1: f439bbc14bffbc91c5e67257ca5f8fc4bd23a788 SHA-256: a027ffb25f8cbe97f6664fde122e93a5feade5dfbb51781b878b62aab65f4445
132 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2014-0496. The critical heuristic indicates that the JavaScript decodes base-26 encoded data, subtracts a constant, and then evaluates the result, suggesting it acts as a downloader for a second-stage payload. The extracted artifact 'base26_stage_000.js' further supports this. The presence of PDF-specific heuristics like PDF_JAVASCRIPT and PDF_JS confirms the malicious nature of the PDF.

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
de5243feb944f0cf151f753ec90739eb516a164b55fc371fca754e3c96184fb2		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15454 bytes
base26_stage_000.js
7a7c742aa78c882e0febe79e6d57f2179e3bb3c952ab9a941e9371f634f3d1c5		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5883 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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