PDF malware analysis — malicious · 6468f1e9ba3067ea

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: a33ddaad35388ac59f4d371f85ab2bb1 SHA-1: 7a25813a9f343aecb1b535383e59b20be35060f6 SHA-256: 6468f1e9ba3067ea2ea168be9ccd200da6387c9d167be77420cfdb2f89d13442

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 JavaScript is designed to download a second-stage payload from the URL http://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RyfUBdKmpBZTZ1QmVwQEs7cDxzKy9FMDVGWDhYInJWInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkMHNqWSlHWWxzeF8iYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn06ICs%2BKyJWIkhTT0slUjMibHopImls. This indicates a typical downloader or dropper functionality.

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=OkExQXtfczN4c3RyfUBdKmpBZTZ1QmVwQEs7cDxzKy9FMDVGWDhYInJWInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkMHNqWSlHWWxzeF8iYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn06ICs%2BKyJWIkhTT0slUjMibHopImls

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `06d128dbd80940e6a0f55bd5b0ac2c2dc881de2789149a6b3014d38dfe5fd97b`	pdf-javascript-stream	PDF /JS object 1 at offset 0x16	35 bytes
`javascript_obj0013_001.js` `112fd32f07a2bfd39ae930897713b4ec0d095cc5ce1b45a4054c661cfb79c85c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3A7	2605 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `7b61e908c8e2a4a3b90d0e333e34c2cc970960e43c6f34b815ad59740d911d8e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3C9	3180 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` `3d8b2e08dc0b3392816d4e996bf2939d00e5d665d34f8b4b777ebc4ceafe2b38`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3A7	2603 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` `ea1b72adc191484737e134e7023ccca473c8bc3db64f35a6690401b729092491`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3C9	3178 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` `a7e12e4ab16cbd38c3db6e4f6c9290d8866b4e969c563697cbde33c45b94d2b0`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5818 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` `8f285c3e1ec6d16fb4dd00c332c2be0ae03e7bc745743b36118d8ef9c087f95e`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5822 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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