PDF malware analysis — malicious · 7e8bd8ae01f75400

MALICIOUS

PDF

22.9 KB

MD5: 4321510f8e3d81558267112359a31b4f SHA-1: 7afae0c103cc411ba71781ea0b85de3fd20ce306 SHA-256: 7e8bd8ae01f754006ffc15f92090f29c2f88219a81339230750722f0f249d90f

250 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains obfuscated JavaScript that leverages the CVE-2008-2992 vulnerability, specifically using `util.printf` to trigger the exploit. The embedded JavaScript contains a URL that is used to download a shellcode payload. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_util_printf

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `8f93504e21f97c49a8db25c555b93c6e1f23d42c2a0cc940c3113d9e659cc184`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3864 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `ce521994d0b18cc2ecb474f7bb6be933e578c1d9c0bcaaf9009d2b81753c741d`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10DC	15367 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `75e0e51377c44b62dbf724daf9cb6e743958291cd0d8185f626e05efb0375b31`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4D19	3649 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111711_003.js` `83936fd75e690b27a73b2ce8b0093bd395af656fe16ae0d07658db8c1ead616f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	23036 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 16 long base64-like blob(s).
`javascript_obj111712_004.js` `318e4b81fbcaf7f9188db6108a19dfe23f72d28c97fbc468d31f8d1aaf03ebe3`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1100	19118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj111713_005.js` `9640c7dff2ec6860169912612ad5e4da11b378d5862d26617e34811b1a59d648`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4D3C	3698 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `098a5d70980424bce5dc9e1499d711068ccb4c8584c248f5a1f887ef2630b462`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10DC	1417 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `34feebbbf0ee64a52f53dce0c98530b4b073203d6a605ba6fc0e3a735084f8c8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4D19	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `4c147a3317eb156b8d102a1f4a9022870abb4618a90d920df820116ce290fe33`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1802 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_003.js` `52c5128d8c3bb00678a95f56deae42a2a52be03b1f9f7ad5864c3e17c969337d`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10DC	9399 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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