PDF malware analysis — malicious · 839e03d21e21c50a

MALICIOUS

PDF

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

MD5: c8908325bb3862c5d7ad1e91dae9dc1e SHA-1: 041fbac285bc1c1098dca2f2e549db75cc4c222d SHA-256: 839e03d21e21c50ab75611b1a6b387776bb59c67f748885ca4f4be74addb04af

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 object. The JavaScript includes a URL, http://domoktov.com/bu1/news.php?dd=OkExQXtfczN4c3RydjpuWklBZTZ1QmVwTjgxdFYiIC9FMDVGWDhYInR3InFnXW1xQnVhVHUibiswSHZkX1lBXzB2ZCJTdVJbbDE7LDY7IlpGamQxM0dlKHNJdVEiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1TYGRZKyJWIkhTMlh5JzMibHo5Imls, which is likely used to download a second-stage payload. The ML classifier 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://domoktov.com/bu1/news.php?dd=OkExQXtfczN4c3RydjpuWklBZTZ1QmVwTjgxdFYiIC9FMDVGWDhYInR3InFnXW1xQnVhVHUibiswSHZkX1lBXzB2ZCJTdVJbbDE7LDY7IlpGamQxM0dlKHNJdVEiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1TYGRZKyJWIkhTMlh5JzMibHo5Imls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `2fa03cbca54cca73b5aff35bed09cdb6ac23cdd4ff407a6627f94da0d91c2c45`	pdf-javascript-stream	PDF /JS object 13 at offset 0x39B	2647 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `6d95597d64d6805496a0186249076da8fa95f135bf37c5c81a2fd33d5073551d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3BD	3237 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` `e8c7e88707c68c16265cef4877b661782527ecfdad81b528e91fb415ec2dbd01`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x39B	2645 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` `c5a45fddc50afb6d11cef67e5ac5a13a3874f6ed33967d2fad32ccffa8e16665`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3BD	3235 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` `0e533c58224397a67b55087e9e8cb15f01d03f7c2ab44fcce604c53df2ed1d2c`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5905 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` `569ad1b82cfc81bfae4f992c531e3ab706640c5a259b8f446f9bf91f0d1d2ace`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5909 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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