Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb3aef990e10d1b…

MALICIOUS

PDF

6.8 KB
MD5: 131ae809e2dcb74d16b8d4a25db0a640 SHA-1: ebb067042cd5a802e9e03c741001772d7d0aea9a SHA-256: 3bb3aef990e10d1bc2724a47faad1db3c5bab7fccaa21acac0ae3d32b32fc2af
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. This vulnerability is used to execute a base26-decoded JavaScript payload, which is likely responsible for downloading and executing a second-stage malicious file. The specific nature of the second-stage payload could not be determined due to obfuscation, but the exploit chain is 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
3e4c192074e62cff52a12613dd2848676f524d50b85ab575c9597d68862dd4a4		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15604 bytes
base26_stage_000.js
f4499d9ba3a213e3bfdf4c2ab342de87aacbee9024c9afe3397b13caa9ceaf11		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5943 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.