PDF malware analysis — malicious · 19ecd80bb91337ac

MALICIOUS

PDF

22.0 KB

MD5: 91d5e38d436f09df0ec39827f20f7515 SHA-1: 5644e2046ae0ffd0a00603798b5389c9b9cbee3f SHA-256: 19ecd80bb91337acb8f83bca88599d9d7605c7fcaedf742143b07be5aa7af4ee

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.001 Malicious Link/URL: Malicious Link T1059.007 JavaScript/Shell Scripting: JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2008_2992 firing points to the use of util.printf and encoded JavaScript, suggesting an exploit attempt. The embedded JavaScript streams and deobfuscated JS files likely contain code designed to download and execute a second-stage payload, leveraging the CVE-2008-2992 vulnerability.

Heuristics 5

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
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `9156185d8dd487e82386e166313e6414863835ca2a58a9effd962764e71fa8b9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3483 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `e7abd5627b8c56d93aeda0de8d21b0f7c57ad60115e7eec593adbac905cb3aac`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF5F	13781 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `acd902f0283f3a8b59c8205238b453304fd55f704d9e21f69ef8e5e5d1318cab`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x456A	4637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `2fefb88ae4b7d92314c32a2bcb3cb5c62e501880eaba5a05edea7a83a2d68b1c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF5F	1419 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `34feebbbf0ee64a52f53dce0c98530b4b073203d6a605ba6fc0e3a735084f8c8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x456A	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `67be21a8f962b6934f32f5b59201d6956d4f9ecefbb63717834949c512a75e6c`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF5F	1804 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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