PDF malware analysis — malicious · c4d795a950e74104

MALICIOUS

PDF

60.8 KB

MD5: 080fa27f1e0c9b33c98180ae5163b420 SHA-1: 0ef7ce02b70d4d6cb6cff2de5eee267cbf766519 SHA-256: c4d795a950e74104150b2b3820e747038e3e8df60c99e67942b2994118b61e03

358 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes a character-table-based obfuscation technique to evade detection. This script is designed to exploit several known vulnerabilities in older versions of Adobe Reader, specifically targeting functions like media.newPlayer, Collab.getIcon, Collab.collectEmailInfo, and util.printf. 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-36310 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36310
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` `c740763bc1c2c7e5c8d242e28b8fa3cee6b1358c319071736011c15d19427bd9`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2D4	53658 bytes
`eval_char_append_stage_000.js` `644ee7d5b0a58de0544ce6d9bfc3cf98da201e3b664da7e3e46b212e415d48fd`	deobfuscated-js	eval character-table append decoded JavaScript at offset 0x300	3846 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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