PDF / .ORG malware analysis — malicious · 79438e9e1e456e4c

MALICIOUS

PDF / .ORG

17.5 KB

MD5: 6fb789dcafa062788d069992c7646e21 SHA-1: 3541a2054009fed4279e083aa545bffba05acc57 SHA-256: 79438e9e1e456e4ca9afbee4aa270affbb31957b4183c3286834bba079ae467a

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages CVE-2009-4324 to execute arbitrary code. The JavaScript is heavily obfuscated but ultimately attempts to download a second-stage payload from the URL http://www.webguild.org/tech_old/.svn/.l.php?l=1&spl=pdf_newplayer. This indicates a typical exploit delivery mechanism.

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. (identified after JavaScript deobfuscation)
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.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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://www.webguild.org/tech_old/.svn/.l.php?l=1&spl=pdf_newplayer

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `e031c13116fdef468bf26ddaa9ebb354b8070ca1f319b4c4c7c37b301dd21132`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3350 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `edc33a186e0ca85e940bb15f980e420a26ffb1fd72e56bb44a8295339138727b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEDA	11488 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `a8cac41e1a3378b2f37e54c5b82b3dfa9545ac8b7f1adcf8f0827d1a2070f493`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3BF0	2492 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111711_003.js` `353fa37ae4c3ebb76c5236e9d5fee010ae64a72661cd19750700e7c830f7342e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	17486 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 17 long base64-like blob(s).
`javascript_obj111712_004.js` `2634739eab142b0e27a81a8f28794cfe1c186aae6ac2f9659ec6179de6caf510`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEFE	14082 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 11 long base64-like blob(s).
`javascript_obj111713_005.js` `010a6aec52ea4d9a8569bb9842a27f6a928dcf63113b6076525ce93263d520ee`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3C13	2541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `6c54df6ab53f15f79b35f00c9103e1323ae09016c1693b13b1ab965fa58f8b0b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xEDA	1080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `0d789c12b55dd19b73622cc66399fe391069ac59987d806e5025f01ce66241ca`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3BF0	170 bytes
`legacy_pdfkit_stage_002.js` `808b0484db9c0a1a5e97546294ae74f8b31366cbe912c43de2fdfaf673ab40c3`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1251 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `839cf088ab059d00d2c76315f7e9744074191546f93ade22865c7e1f98559106`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xEDA	6430 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).

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