PDF malware analysis — malicious · 74c3c085a10f522d

MALICIOUS

PDF

18.0 KB

MD5: 082c3667f6aea5523a0fa715c40d5e4c SHA-1: b1fb81af00a6b0b60c9296035fcc953ea60c9af6 SHA-256: 74c3c085a10f522d173249b8f7d91b976a19bda98b17098ad0a684ac8ed3340d

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that exploits CVE-2009-4324 using the media.newPlayer object. This script is designed to download and execute a shellcode payload from the URL http://gospeltoke.com/cache/.svn/.p/.l.php?l=1&spl=pdf_newplayer. The use of eval() and string concatenation for obfuscation is a common technique in malicious PDFs.

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://gospeltube.com/cache/.svn/.p/.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` `85915483c5446278e84daa77506abbe4864d463cae82f26600f13d9e823ee17b`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3056 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `7b46a2aabe2dd84e91a12d4d79e29a695f7e38f511735a3318463ebd83c415f8`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDB4	12361 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` `edc2ca99a6379659597ad29a9556c09d02abd6d55e34f97fd80384cd92c6e172`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3E33	2398 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111711_003.js` `6a48a813c8faa0c4de102930bf552c6a068467a37331fe8aa6e8e03f69f64d8e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	17971 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 13 long base64-like blob(s).
`javascript_obj111712_004.js` `e4aa22404b3f9c0620af4f24b7febda6c9d8a6505f027a644e6023f2fb7b4615`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDD8	14861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).
`javascript_obj111713_005.js` `6564a0ccb03ab4e0feaa5446912982e2eddcca43b95f5da5727c6f4c50069937`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3E56	2447 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `05d944cb83426feb3449414ddb541f56893760c1ae15d9955f5c78335d4af43e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDB4	1084 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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3E33	165 bytes
`legacy_pdfkit_stage_002.js` `9027b10e3c09c7ebf61ff13f5d0fbc84f39177828ce83d479647c3a7dba4d228`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1250 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` `209527ee06077f592b682363587f6090d56a8f7cf49799771e3b9bbbd5ba0f1f`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDB4	6420 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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