Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea043927a7361d36…

MALICIOUS

PDF

6.8 KB
MD5: d719a2d16d81b1b4763c1d07da9b5536 SHA-1: af24d16e4332cc7e5af3c181718f753625e77469 SHA-256: ea043927a7361d362c89b259f70d87e62374abc8c5afb04dd831cd306f3c65ba
94 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 firing indicates that the JavaScript decodes base-26 encoded data, subtracts a constant, and then evaluates the result. This suggests the script is designed to download and execute a second-stage payload. No specific malware family was identified, but the exploit and delivery mechanism are clear.

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
d362e91043dad996f08362f7c650d22ed5e7d1a420de5abd56554661102baa24		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15664 bytes
base26_stage_000.js
3d037a2d6f165ebe2b04842bc8f7490af2d9d4e2599fad925b92c9fe9de88254		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5967 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.