PDF malware analysis — malicious · 0355b0b91720b079

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: 22e376db60eac84c97533aa5bf27d448 SHA-1: cae95649087259aeb7a83eb664ee7df436427826 SHA-256: 0355b0b91720b079887871a4c732ae835573d4fc9c7a75c3ebced3aba615c4d2

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 (media.newPlayer). The script is designed to download and execute a second-stage payload from the URL http://121.101.216.203/aaff/news.php. This indicates a malicious document intended for initial compromise via spearphishing.

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://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RyJSAhdCxBZTZ1QmVwMEZFOCA1LS9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkWUZORlk9NCtzM18iYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1aVzh3KyJWIkhTRHhXLjMibHopImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `21be9ac1517b79ae3cd98d945ebaff63d2c13013e7edad49ad670c97d91d7ab6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x392	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` `b0d329f9365d8dd54d397f87c0c6f613f60982a878282a7db0edbe31ddf3d99f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B4	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` `9c7f9838dc6891db8406d51c6ec67af021b6ea784b771c5066513e74600345d5`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x392	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` `c8a45f10083774d0b48a6e9bf85b52cc3cca42a61cbc7a335ece406b2b331e71`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B4	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` `b78c75a687b4b2e4ca59e90b81206dc478f6c7ecc69e4f40d7a247d2010b0eda`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5815 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` `2fb401b7a89f23edcca5b2642513baf92622a7e3f300bc7e7c9f1bffe9d2eea0`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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