Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b8178a77a5f5a1…

MALICIOUS

PDF

6.9 KB
MD5: c62c8580ff198bb1b6b30f030c2fcf5e SHA-1: 0edeae93575a4100e28a26ecf53924b130294b49 SHA-256: b0b8178a77a5f5a1a76a3f511d34c71604f954c5e6e8c8110c7acd66dc73be5f
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 using app.addToolButton/removeToolButton. The JavaScript is obfuscated and appears to decode a base26-encoded string which is then likely executed as a second-stage payload. The primary IOC is the CVE identifier itself, as the specific URL or hash of the second stage was not directly extractable from the provided evidence.

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
f34034acf9174e0d0c1194b905285c0554f1909d107afe65701b707168622416		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15904 bytes
base26_stage_000.js
55873fcf1f78d6114a6130b25e03cb5e1853eb8f3d5094b10eb266afe7fe6f43		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 6063 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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