PDF malware analysis — malicious · 0383fc57f59d24cc

MALICIOUS

PDF

23.8 KB

MD5: 0eacd97472b668382921c073db21a185 SHA-1: 39532a17fe59b22fdba347b68ba9df216372f642 SHA-256: 0383fc57f59d24cc2269e43701021ffd3557e6e2312cf91887a42a4687263868

250 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that leverages the CVE-2008-2992 vulnerability. This script is designed to download and execute a second-stage payload from the URL http://gospeltoke.com/cache/.svn/.p/.l.php?l=1&spl=pdf_util_printf. The use of eval() and unescape() functions, along with complex string concatenation and encoding, indicates a deliberate attempt to hide malicious activity.

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` `e6492920a9ab4f5e24145c52884048a9f83c0124ee204b708c24e9bacfc6cb4f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3734 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_obj111712_001.js` `caaaab809408c71cc64651012b1fa2c1a3031cbffc8985fdea47a75d2dac1fa0`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x105A	15376 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` `5fa323d525007630bcace14eaff001ec650ced500d311f607b16c499ab0ca425`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4CA0	4628 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` `0507445d59f179b285005d953fd7ff7f76231488222ed6e592a589d3a3534052`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	23894 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 15 long base64-like blob(s).
`javascript_obj111712_004.js` `47317c716fcb6df32cd5cf1f5899faef3dd25793dd9701f1128209a30c9821e3`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x107E	20106 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` `e7bd70a4dab8736c5c21d68e5a3994890ceb48bed9707b51d6fe52384eea6aed`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4CC3	4677 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` `2ce519949289064cac4d9ec5e2f03616b7ef69d371aebd8dd98fe04454eb0f63`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x105A	1413 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` `df2e8f38acbcede11c3621c62802a425613ee3b105933e1debbf6452a55bb89f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4CA0	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` `5ec905c90d55fcf4d2b0c31249c4101d8761487d182402b89b67aed6b1434733`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1798 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` `8f8177e35ecae1e2101f74a95a60e66f6f384ff08c4bf2fc99f6727babdd8552`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x105A	9379 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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