PDF malware analysis — malicious · 76b11f35511e9c90

MALICIOUS

PDF

4.1 KB

MD5: 7bad7cee621ffefad0b033e7ece6fe0f SHA-1: 4338799eaf7c223593c5975b6c50cc7514733ebc SHA-256: 76b11f35511e9c90452a2aee333ac3e35372e6c85e76d1a1d34cc5a1e02ca0be

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and utilizes eval() and String.fromCharCode functions, indicating malicious intent. The critical CVE-2008-2992 heuristic firing suggests the exploitation of a known PDF vulnerability to execute arbitrary code. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `1cc86656745862ceaae73670382c38ac61fd448bcaac4ecb31b1ff7a52b8b216`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20842 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` `ae442f1fb1f49284485d9958e3f7b83e5f8826a9bec5f342711f9043557a7ac7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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