PDF malware analysis — malicious · c21572de022997fa

MALICIOUS

PDF

302.5 KB

MD5: eb75c515d2374f6256ba924b183ae949 SHA-1: e338de591318221791c297e36c7c966b02eb3967 SHA-256: c21572de022997faedd97b3b063f0e3291e6f87d5c9fc9518154f1739aafaaac

298 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These vulnerabilities are leveraged through embedded JavaScript, including the use of eval(), to execute arbitrary code. The deobfuscated JavaScript stream suggests the intent is to download and execute a secondary payload. The reconstructed string 'v'+''+'ar bDPIgYOsmL4 = y'+'["g"+YagcIFLOxf1+"t'+'A"+"n"+"n"+""+"o"+"t'+'s"]( { n'+'Pa'+'g'+YagcIFLOxf1+xiXMlsJwYz0+": "0 } 'var hTVfrnOIPt6 = XkAcefHSTP5["r"+YagcIFLOxf1+"pl"+xiXMlsJwYz0+"ac"+YagcIFLOxf1](/b"+YagcIFLOxf1+xiXMlsJwYz0+'x11/ig,AFxYRjQbfp3 "xqxNydlMVY7=u"+xiXMlsJwYz0+"n"+YagcIFLOxf1+"s"+xiXMlsJwYz0+"c"+xiXMlsJwYz0+"a"+xiXMlsJwYz0+"p"+YagcIFLOxf1+"('+"un"+YagcIFLOxf1+"sc"+xiXMlsJwYz0+"a"+xiXMlsJwYz0+"p"+YagcIFLOxf1+"(hTVfrnOIPt6 xqxNydlMVY7' indicates complex string manipulation typical of obfuscated JavaScript downloaders.

Heuristics 8

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)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `006dde2563b31e23d97165d0d961353395b6f99e85a393ec688a4749bdf232d7`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1F3	1385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `3a3cd811a8b0b320ff2015833f2e878831bdbb56598f77ff3e1c4bf06e254b1f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x793	14642 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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