Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbde105d70e2676…

MALICIOUS

PDF

6.7 KB
MD5: 1cfc4d7eec25d527412c5414ba628575 SHA-1: 436fcbfeb0eb94d7998447d926ed3ec3edf63b08 SHA-256: 0fbde105d70e2676243aa65d9e5e6b586b5ce793cb34997c7e81ff8eb57be89e
226 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2014-0496, a known vulnerability for client execution. The script is designed to download a second-stage payload from the URL http://ogenblikkelijker.estaciomuntanya.com/world/defect-cabinet.txt?e=9. The ML classifier strongly indicates maliciousness, and the presence of exploit-related heuristics confirms the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • 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)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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://ogenblikkelijker.estaciomuntanya.com/world/defect-cabinet.txt?e=9
    • 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
5ca22b12bf48395fe2c95b1165742a7c5dab211866d48ee2445150d81a8a7e9c		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15500 bytes
base26_stage_000.js
bdea3d405f199762bf823b081dce12d9f1df591c665bf729c94ae674b8c58924		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5901 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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