PDF malware analysis — malicious · b41b86f4b3d56963

MALICIOUS

PDF

94.7 KB

MD5: 65c742045d9c9c4dd46bf0d20dbd5c60 SHA-1: 367a81f1b40b1e057203b319255f83e0d7943024 SHA-256: b41b86f4b3d56963b0e5c912756398176a261f74add097d7b5cf38eaf815bd7d

396 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1204.002 Malicious File: User Execution: Malicious JavaScript

The PDF file contains obfuscated JavaScript that leverages multiple critical vulnerabilities in older versions of Adobe Reader. The JavaScript is deobfuscated using a character-table eval stager, indicating an attempt to download and execute a secondary payload. The specific CVEs targeted suggest a classic exploit delivery mechanism.

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-36390 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36390
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` `ac793a63f734a7f149498c856c4120193d1feb6ceaeb114077f13999a0433f20`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2D4	88357 bytes
`char_table_stage_000.js` `c4e0a0cd96f2e1d14b59ad7e2bea9dee2d7b3824125ca0ed04274ad62c05c3b8`	deobfuscated-js	char-table indexed JavaScript (PDF /JS object 76) at offset 0x31F	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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