PDF malware analysis — malicious · 852711233464ef7b

MALICIOUS

PDF

68.3 KB Authoring application: sli

MD5: b3bee396802f5b726a2bcd8acc3ceb57 SHA-1: d9b1a53288db913020f494bdef86e70575575c5a SHA-256: 852711233464ef7b45dd2053dc8a9b140af96d60aaa801587239cbe7717b3bb1

358 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript T1190 Exploit Public-Facing Application

This PDF file contains embedded JavaScript that is heavily obfuscated using a character-table indexing technique. The JavaScript exploits multiple known vulnerabilities in Adobe Reader, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The primary purpose of the script appears to be the execution of a second-stage payload, as indicated by the 'Dropped-91' ClamAV detection name and the presence of deobfuscated JavaScript streams.

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.Dropped-91 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-91
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `c7fd0175099f8331742d248b8c95eb223d8d5c9f893645abb34857c25a45102d`	pdf-javascript-stream	PDF /JS object 76 at offset 0x42D	61292 bytes
`eval_char_append_stage_000.js` `9594253d96d52d8b2c19ce9c3bc3eb1c4ff1ab7fdb5ac04b652e85490abc129a`	deobfuscated-js	eval character-table append decoded JavaScript at offset 0x479	3618 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).
`deobfuscated.js` `ae3696d571ae1d2112a65f624fbb1fb4f47bc9db34dfd6a791a6ec9208bfb2ca`	deobfuscated-js	PDF JavaScript deobfuscation pass	65503 bytes

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