PDF malware analysis — malicious · 7aa8f820770ccead

MALICIOUS

PDF

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

MD5: cdedaf84e24a8e4bd667391b2a616f8c SHA-1: 1968085cb5402e7ca5bb47a9f2d1802b93d5462f SHA-256: 7aa8f820770ccead61eb221fcbffce514c0450a86841c31253899ee512bce32e

250 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. The script is designed to download a second-stage payload from the URL http://weneedyourgold.ws/bu1/news.php?dd=OkExQXtfczN4c3RyJV1tYX5BZTZ1QmVwJClJUyNjRy9FMDVGWDhYInJWInFnXW1xQnVhVHUibiswZHNtOkdwQVY%2FbSJTdVJbbDE7LDY7IlpGditPVkZZZS1JcngiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1CfTJSKyJWIkhTIXI5azMibHopImls. This indicates a clear intent to execute arbitrary code by leveraging a known PDF vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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
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://weneedyourgold.ws/bu1/news.php?dd=OkExQXtfczN4c3RyJV1tYX5BZTZ1QmVwJClJUyNjRy9FMDVGWDhYInJWInFnXW1xQnVhVHUibiswZHNtOkdwQVY%2FbSJTdVJbbDE7LDY7IlpGditPVkZZZS1JcngiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1CfTJSKyJWIkhTIXI5azMibHopImls

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `e453758ffd162dd60207785bdee4650b66da9108a2aa2b8192fbdb4e1c104a05`	pdf-javascript-stream	PDF /JS object 13 at offset 0x396	2392 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `efa849eaa667fcadf540d455d84902a5eb6b8bc28cde0f56013251ff97426ad3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B8	2982 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`combined_document_js_000.js` `a0557ff578ae8cba1fea18fd9975c2dacf95690433b77585feec2fdba62c772d`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5394 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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