PDF malware analysis — malicious · 6c8a818ad94d55ab

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: c89060b7c4d3a8023bcf9337a248eb93 SHA-1: c75534861830bc44d7133d6c0089bc53676354a4 SHA-256: 6c8a818ad94d55ab7c343fc64e6c98f797fdd0439505744f42e51fc31912a759

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 using the media.newPlayer method. This script is designed to download and execute a second-stage payload from the URL http://61.4.82.213/bu1/news.php. The presence of exploit cluster and shellcode download URL heuristics strongly indicates a malicious intent to compromise the user's system.

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://61.4.82.213/bu1/news.php?dd=OkExQXtfczN4c3RyciA8Yl1BZTZ1QmVwMVUjNU9JYC9FMDVGWDhYIktEInFnXW1xQnVhVHUibisvL2RpV0pBTXV2ZCJTdVJbbDE7LDY7IlpGTllCd1lWaGlZKTMiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn0re0d6KyJ1IkhTZU1QaDMiRikpImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `4861cba75d91c971682c4e7a77493b64d0b322f9f1466bf4e3199ad18ca3ac74`	pdf-javascript-stream	PDF /JS object 13 at offset 0x390	2586 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `1cc468731cc85881aeafda2e42377b26d73bf1cbf8a87e97e6dba0ad8931dea4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B2	3161 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` `e799448baafa4351aa20a075e932bf6bc1c376546e1b69e2b9f0cbd2d5d79332`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x390	2584 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` `43da39aeb7e1815da83b19c5a87162d2c50b692794c3fd7cb6beccabeef107c3`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B2	3159 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` `83274cb109447ec0553f025e7580ebf838fd358d6ea2a8027aff3b53de8732b9`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5757 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` `c234c4d9942f3e216ffbbddace658869f7a83e0ca6cb765fff78e8c0c1ae132f`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5761 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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