PDF malware analysis — malicious · c20c0f9d539a1f16

MALICIOUS

PDF

4.2 KB

MD5: 6b134f55f6df112b26e11f6ba16ac166 SHA-1: 9b344056284b77a4f9ed9fe97c4af1896561bfd1 SHA-256: c20c0f9d539a1f16c7201cf087ed0d0c73b45459f366152269213e12778317e3

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE-2008-2992 heuristic specifically points to the use of `util.printf` to decode and execute JavaScript, a known technique for exploiting PDF vulnerabilities. The deobfuscated JavaScript stream (`numeric_charcode_stage_000.js`) likely contains the malicious payload. The exact nature of the payload is not fully discernible due to obfuscation, but the exploit chain suggests it aims to download and execute further malicious content.

Heuristics 6

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
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_obj0005_000.js` `bc52307aef6592f23f3241e03d3201515cf7a0b6b69916b0e24c5e98486f0b38`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `193ed0ceac52efa13d892bf12badadc628a97e8ee303d83f3a80ffb64ccb7486`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6339 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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