PDF malware analysis — malicious · b4f29d6040aaf5c3

MALICIOUS

PDF

53.6 KB

MD5: 012fc6052c47b927d05dea9ff3b94355 SHA-1: d5ccce3b6265bd48645dd42bc9e904e14141fdf0 SHA-256: b4f29d6040aaf5c3d0dbf57ec58da589b9f61c078856e050a850cbc975d104ad

358 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script: JavaScript T1204.002 Malicious File: User Execution: Malicious File T1190 Exploit Public-Facing Application

The PDF file contains embedded JavaScript that utilizes character-table indexing for obfuscation, a technique commonly used to evade static analysis. Critical heuristics indicate exploitation of multiple CVEs (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to JavaScript execution within Adobe Reader. The deobfuscated JavaScript likely serves as a stager to download and execute a secondary payload, as suggested by the 'eval_char_append_stage_000.js' filename and the heuristic 'PDF_JS_CHAR_TABLE_EVAL_STAGER'.

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)
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)
ClamAV: Pdf.Exploit.Agent-36395 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36395
Character-table JavaScript eval stager high PDF_JS_CHAR_TABLE_EVAL_STAGER

PDF JavaScript reconstructs an exploit stage by indexing into a small character table, appending hundreds of one-character fragments, joining the array, and evaluating the result. This static fallback fires only after the bounded decoder recovers an exploit-like stage, so it catches this obfuscation even when no single CVE API signature is available.
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_obj0076_000.js` `d1f619a4e9e8a105ad4b74d92f92786ca2a5141b769976909f8a2377a39b027e`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2C2	46274 bytes
`eval_char_append_stage_000.js` `e1c4b8452b16963d5060b54592c11d3b9dc7c1cea6c68491914d08d74f8cb342`	deobfuscated-js	eval character-table append decoded JavaScript at offset 0x31F	3858 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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