PDF malware analysis — malicious · 5bd01d29422ae047

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: 061186d6fef44aa434ff1de4908adb65 SHA-1: bfd8c2b03fecfecdf68bc0e1484134ed528da353 SHA-256: 5bd01d29422ae0473b22a857c4b20944b416a6090138ef317c612957e7a5f9a7

290 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains JavaScript that exploits CVE-2009-4324 (media.newPlayer). The embedded JavaScript includes a URL, http://fracala.com/bu1/news.php?dd=OkExQXtfczN4c3RyLmpJenRBZTZ1QmVwaj10I3tCbS9FMDVGWDhYInJWInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpGQjA9VmVlVmktREciYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1wVG5YKyJWIkhTZCRSKzMibHopImls, which is likely used to download and execute a secondary payload. The ML classifier also strongly indicates maliciousness.

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://fracala.com/bu1/news.php?dd=OkExQXtfczN4c3RyLmpJenRBZTZ1QmVwaj10I3tCbS9FMDVGWDhYInJWInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpGQjA9VmVlVmktREciYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1wVG5YKyJWIkhTZCRSKzMibHopImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `80ee663a99ad86cce112ef97360391435262daee3d5c3b0a95cfef2d6de8d7f1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x396	2614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `94f1f2305e26a8c4a18a4f186d235d3f8cedf3a8a5d7b5c5c8bf93c43f7bab02`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B8	3189 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` `f21840c91a7957bb25c173bf29e708a3f89d84225120cc998f2124f1b1ec0ead`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x396	2612 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` `4ff9b85a26bafbf869ef9e466ceaff91114568dc870fc0d077471b0aa408bf97`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B8	3187 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` `5d03c2ce3d4742f993bf707c50ab8888524dcc5494281ad86368104d497ce226`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5819 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` `a9a60526729ed6b0ebeedd2824c664a935f0eeef1122539004e550603f1dcf27`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5823 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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