PDF malware analysis — malicious · 9d37d75e8c8f3e0b

MALICIOUS

PDF

60.5 KB

MD5: 445fa72988809bf6202ca79511995cd2 SHA-1: 8e83d38f4020cb0dd88551f07bc98f8db608b075 SHA-256: 9d37d75e8c8f3e0b1014094040fafe1b677cca0a7008afc9353aadee952d5c89

396 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript T1190 Exploit Public-Facing Application

The PDF file contains obfuscated JavaScript that utilizes character-table indexing to reconstruct and evaluate malicious code. This technique is used to exploit several known vulnerabilities in older versions of Adobe Reader, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The primary goal appears to be the execution of a second-stage payload, as indicated by the 'eval_char_append_stage_000.js' artifact.

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.
Suspicious extracted artifact high 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `dc3d758b8f72d4ba53c2a32ce0767f44e0c0dc2fea938d2256c87bddeb1e7219`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2C2	53342 bytes
`eval_char_append_stage_000.js` `0d62cc442ff213fcbbcbce61818fd11c76bb55bb11c3e65f7b9c700a5a38d4d5`	deobfuscated-js	eval character-table append decoded JavaScript at offset 0x326	3852 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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