PDF malware analysis — malicious · d33b5c57252314d4

MALICIOUS

PDF

117.7 KB

MD5: 639df49fded71ceaa24ea78b105ac83f SHA-1: 49f4f02efd29e80667f568a6533d908c68de535c SHA-256: d33b5c57252314d40d2f62e5ce4bcee8d1f3656b5ed0dc8bda4fd9a8f48f8965

336 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes character-table indexing for obfuscation, a technique commonly used to hide malicious code. Several critical heuristics indicate exploitation of specific CVEs related to PDF JavaScript execution, suggesting the primary goal is to achieve arbitrary code execution. The deobfuscated JavaScript stream, char_table_stage_000.js, likely serves as a stager to download and execute a further payload.

Heuristics 8

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)
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` `8a81aa12cc8b4c85b059c2c918abfe28d3ed0b0135e29681c7b12e6ef0f9bd7f`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3A9	111687 bytes
`char_table_stage_000.js` `5b845581cd0375ecb28e9bcb22ee8c58c13f131fe0ba3716a7ca911baae5ecc0`	deobfuscated-js	char-table indexed JavaScript (raw) at offset 0x406	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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