MALICIOUS
358
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/Shell Script: JavaScript Execution
T1204.002 Malicious Link: Malicious File
T1190 Exploit Public-Facing Application
This PDF file contains embedded JavaScript that utilizes character-table indexing to obfuscate its functionality, a common technique for exploiting older PDF reader vulnerabilities. The heuristics indicate exploitation of CVE-2009-4324 (media.newPlayer), CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). The recovered JavaScript is likely a stager designed to download and execute a secondary payload, as indicated by the 'eval_char_append_stage_000.js' filename and the heuristic 'PDF_JS_CHAR_TABLE_EVAL_STAGER'.
Heuristics 9
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF 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)
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Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927PDF 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)
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Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659PDF 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)
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util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992PDF 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)
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ClamAV: Pdf.Exploit.Agent-36310 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Agent-36310
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Character-table JavaScript eval stager high PDF_JS_CHAR_TABLE_EVAL_STAGERPDF 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.
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.js2a42ea51a6026a74a25d6fab2c2d60d27d7a9058352dea3346ac6d620a4db55b |
pdf-javascript-stream | PDF /JS object 76 at offset 0x2D4 | 53724 bytes |
eval_char_append_stage_000.jsa971c14d88f346a950f07e6bb089c9e92db25d501ed508aa3a3a07c4aac3c257 |
deobfuscated-js | eval character-table append decoded JavaScript at offset 0x300 | 3864 bytes |
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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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