PDF malware analysis — malicious · 7515e464218ffe67

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: 61b3273345749dae7a6897defa6f6c81 SHA-1: 36fd0ad156c17d88429b92bc1045267a8b40bfa4 SHA-256: 7515e464218ffe678824e8c87495084ae221b780137b8de495d466ade81e4a4a

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 also contains a URL, http://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RySkN%2BQkxBZTZ1QmVweVZaaCEuei9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkWUJOd1loKG9nMXgiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1MTjo4KyJWIkhTN2xAbTMibHopImls, which is likely used to download and execute a secondary 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://121.101.216.203/aaff/news.php?dd=OkExQXtfczN4c3RySkN%2BQkxBZTZ1QmVweVZaaCEuei9FMDVGWDhYIktCInFnXW1xQnVhVHUibisyL3NmNzlZTWl2WyJTdVJbbDE7LDY7IlpkWUJOd1loKG9nMXgiYno9eWw5KTt5biI3SzFaM0Q0S0QyQ3JTd1YiNn1MTjo4KyJWIkhTN2xAbTMibHopImls

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `d6761459965b841e19f1599d47268850250d1845d5eb09a1e1d92b8ff526f15f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x391	2643 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `9bf7d03f415be97c399b4e69577c0d3e3cace072f88ff402477547989cd87832`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B3	3218 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` `407cb07668e8eca19c6d0b54dfcd917fdb8630a900746fef4bfcecdd88334c45`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x391	2641 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` `6c78135303b38692b21420adf25a867374d1d13a078504931ad5c1a553349fb4`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B3	3216 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` `8d120fd052bb439337bfa90a6bddf6e1ac7a2c7404ff9962178d03ddf50f5945`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	5872 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` `eb25f3f80524a70a213e511dc602ec00ac7e920405d04f0676f8032ca3ab9934`	deobfuscated-js	combined document JavaScript streams at offset 0x16	5876 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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