PDF malware analysis — malicious · 6580c332dc1c2a93

MALICIOUS

PDF

4.0 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 7cab09bbd1aef15a9cd6aff413f79914 SHA-1: 6363afbfa0e7006ad4a925bba118537d74a78a1b SHA-256: 6580c332dc1c2a93a9de522527dfc4920f212667708191b6edb766de157acbcb

290 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exploits CVE-2009-4324 using embedded JavaScript to download a second-stage payload. The JavaScript contains a reconstructed URL, 'http://cthridd.com/bu1/news.php?dd=OkExQXtfczN4c3RyPEpTeXNBZTZ1QmVwIEk5cD8jKC9FMDVGWDhYIml0InFnXW1xQnVhVHUibisvL2RpV0pBTXV2ZCJTdVJbbDE7LDY7IlpGTk89eVVGR3MrL1EiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn0jcVEkKyJWIkhTIz5qPDMibHopImls', which is indicative of a downloader. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009.
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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://cthridd.com/bu1/news.php?dd=OkExQXtfczN4c3RyPEpTeXNBZTZ1QmVwIEk5cD8jKC9FMDVGWDhYIml0InFnXW1xQnVhVHUibisvL2RpV0pBTXV2ZCJTdVJbbDE7LDY7IlpGTk89eVVGR3MrL1EiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn0jcVEkKyJWIkhTIz5qPDMibHopImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `010e63d4a5c344b89c02194c17ae5cdc9e6be0e3f41d3c2ab18baed8c154b3bb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3A1	2595 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `a8411cbd80655edb5077d81112f9063dab4922841852c6527c02b3af8b859c3d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3C3	3170 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `353a1b5b4174afbe9030946bbf100ee6d5f036e81faf1fe0cb3034a5d25bae40`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3A1	2593 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `3c9cda5f0aaebc367ac512fb4d57734ad4a307450948aa4c89734a87f7fe7db7`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3C3	3168 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `61a0f57b54369bfbaedda1f5c335153f93ab8a416edf06b41a946b06ad0a2603`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5792 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `3cf82a3a8e62b78005238eb77f5f341de5cc04b9529fbcc787bd624e7a3eb6f3`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5796 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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