PDF malware analysis — malicious · 6779882f39b575a3

MALICIOUS

PDF

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

MD5: ecd5c1a7b6071d0980a4434a727e8127 SHA-1: 9bd81e9156d02176ecbb4b35a87db4616b3e852a SHA-256: 6779882f39b575a373e4294a1cffefb2dbf8061852381faa24a722aa341308cd

370 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file containing obfuscated JavaScript that exploits multiple known Adobe Reader vulnerabilities (CVE-2007-5659, CVE-2009-4324). The embedded JavaScript contains URLs that are likely used to download and execute a second-stage payload. The script's primary function appears to be the exploitation of these vulnerabilities to facilitate the download of further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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.
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits.
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.
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
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://bravadio1.com/bu1/news.php?dd=OkExQXtfczN4c3RybXU0cmlBZTZ1QmVwLShIcFguTy9FMDVGWDhYInJWInFnXW1xQnVhVHUibitpSE1UN0dNN3ZrOCJTdVJbbDE7LDY7IlpGcysxND1GVWlzeEciYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn0teHYwKyJWIkhTPHxGQDMibHopImls
- http://bravadio1.com/bu1/news.php?dd=OkExQXtfczN4c3RyI2xfL19rZTZ1QmVwQV9vTWZZci9FMDVGWDhYInJWInFnXW1xQnVhVHUibitpSE1UN0dNN3ZrOCJTdVJbbDE7LDY7IlpGcysxND1GVWlzeEciYno9eWw5KTtwbiI3SzFaaXpLS3dneWcrKHI5IjZ9Xz1sKyJWIkhTLGdOLzMibHopImls

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `40c7de7bce290f162d4b04b6353ae9b3107d637ce0629f3aff9f0baba2d39b2e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x390	4690 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `b7837b047439da7bf07b133eb62c74a7ff49c507ccb54f69d0bfa332963d1e0c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B2	5280 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`combined_document_js_000.js` `95e5b3b74953c4437d8098b5b3967a18682e3b35b4209debd8e1601e98b5d501`	deobfuscated-js	combined document JavaScript streams at offset 0x16	9984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).

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