PDF malware analysis — malicious · de7535adf1df0043

MALICIOUS

PDF

121.9 KB

MD5: f36cd0a63cb585d8f3ee60a2fa5b5131 SHA-1: 9fd76f2ab89d7d913a54bd2ad7a00f0341dc28c9 SHA-256: de7535adf1df0043b3bab0031f01acc45f3769ef359e5fc69faf987ea88c3363

358 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes a character-table-based eval stager to deobfuscate and execute malicious code. Critical heuristics indicate exploitation of multiple CVEs (2009-4324, 2009-0927, 2007-5659, 2008-2992), suggesting the primary goal is to leverage these vulnerabilities for arbitrary code execution. The deobfuscated JavaScript likely serves as a downloader for further malicious activity.

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-36387 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36387
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` `f3b9ea71af3cbaff01fa03321d996fb05fd5131be432acb5b5d8422f67e300f6`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2C2	108371 bytes
`char_table_stage_000.js` `efb18363df0b15dcfbd83bc7c200624837050e6bb40d2a3003c34e8fe9c0ce2c`	deobfuscated-js	char-table indexed JavaScript (PDF /JS object 76) at offset 0x2DC	3888 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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