Malicious PDF — malware analysis report

Static analysis result for SHA-256 931c180a047dd3dd…

MALICIOUS

PDF

6.8 KB
MD5: 0b4ba1d5483313790d6616f7f70799ee SHA-1: f33e95135c637765381cc048bdef135c135ca08d SHA-256: 931c180a047dd3dd67fe6cdce90bf424c841732377e779709feeff0b4fe55af8
94 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript that exploits CVE-2014-0496. The critical heuristic indicates that the PDF launcher decodes base-26 character pairs, subtracts a constant, and evaluates the result, leading to the execution of a deobfuscated JavaScript stage. This suggests the document is designed to deliver and execute a malicious payload via this exploit.

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
1ea0d1f3c944016fabb8d7d3a13ad00555f5d6cd76d381983ac67af82897a927		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15680 bytes
base26_stage_000.js
b0408f61972121bc651edbe2e2cde5b40639e5a78908ca34aaf2c19a2a8b61f2		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5973 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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