PDF malware analysis — malicious · 863637b357a7544d

MALICIOUS

PDF

24.7 KB

MD5: fa0e2b0cc3767b86b94d66356667cb1e SHA-1: c9622370fe4193f1cfd5f0235cdc0ec0c3b04257 SHA-256: 863637b357a7544d962a3b23bf0bfb4cd25714a188c4f64225648e07130934c0

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 util.printf sink to exploit CVE-2008-2992. The script is designed to download and execute a second-stage payload from the URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_util_printf. 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` `9c5d7a1ab826bc2b7e80765e83fd60a17a3820670961d1fdb841c5006a70ae1e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3876 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_obj111712_001.js` `5f1439baf5e3cd563fdfc9d84f4377641f17d25b7e7b2557d7a8f893c32094f1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10E8	16173 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_obj111713_002.js` `1d40067b74df1f6c294aac434474a924c5936f3d964b0ab7d156abce14523b08`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x504B	4664 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111711_003.js` `f351005f8a4d6297fd9b31805750cc7a921ac50ab21d6bd80289a959998d83ad`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	24869 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 13 long base64-like blob(s).
`javascript_obj111712_004.js` `fba2186050c4757da873d91a9b3e01283ce36516a5561bbd8a4f67a360d6a409`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x110C	20939 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).
`javascript_obj111713_005.js` `f31f046641fb64bbd19e759a343dfbf6e315011a317a75a2e10f19c7d0e13026`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x506E	4713 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `a1d8f6e8155bb2e5aa7fbf810d40a596f9ddb89a36936ac07f752ea8785e0b6a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10E8	1419 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` `6e94ee437c4584e45777dfdfe59d60b90cbff67e893f070d813b25c91845f656`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x504B	389 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `02ef29541246fdc6e566fb9fc9c7a37a5fe26e8d3d595c9a6c2268a1324f51ae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1809 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` `4c6f08053b47cdef430a780295211a56c4c55343127ea5ecf51bab6f639d2d3d`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10E8	9439 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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