PDF malware analysis — malicious · 1368143c1fee4f56

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: f7cbac141ad981d7399281973cfe1be0 SHA-1: cad707ca9f328a2f372610881203e897641b1fee SHA-256: 1368143c1fee4f568041ea76d4b6f243700a79ea3f2b9b5d1619823b2990b290

290 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2009-4324 via the media.newPlayer method. This script is designed to download and execute a second-stage payload from the URL http://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RydiY9L1FBZTZ1QmVwIE1hV1FuUi9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkWTU1ZWhGaGxvdF8iYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1RQ2hfKyJWIkhTVnMqeTMibHopImls. The presence of unescape() calls and generic stage recovery further indicates a malicious 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://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RydiY9L1FBZTZ1QmVwIE1hV1FuUi9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkWTU1ZWhGaGxvdF8iYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1RQ2hfKyJWIkhTVnMqeTMibHopImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `01060d126759d5ddf589d5eff16afa9432bb732c72c05f00b273a38c7f3b57c3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x390	2624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `dbebea9525657e7f464bdf6829c1d426fc8ee038f78e754c356331da3afb667f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B2	3199 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` `3a2ce6e211fc3604b7c6202541690c2a41c8038a862d7dd3a93370c4a80621f1`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x390	2622 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` `781da2b5057c5beac4bb2a636ef17fb9ddc992c52752ecabd99ee9088fb5de63`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B2	3197 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` `8aa371f5de3637feeb3f3c134b64b20240f91c7811bd26ec68ff993fcd8df9de`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5833 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` `042d61e75a2abd413ffffcfb4bfca0d4f1c16d12bba6845589d5fa68d38447eb`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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