PDF malware analysis — malicious · a5fb0dbf563dafb4

MALICIOUS

PDF

4.4 KB

MD5: 5b601c013df53c4050cffabb04d485bb SHA-1: ec1bc418266d218b86de095c1bb4e074ff5e406f SHA-256: a5fb0dbf563dafb46b00175125473d7afa2178f46cf47d34d7681de921f7a944

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is executed using a known vulnerability (CVE-2008-2992). The JavaScript is obfuscated and uses `eval()` and `String.fromCharCode()` to dynamically construct and execute code. This indicates the PDF is designed to download and execute a secondary payload. The extracted JavaScript files are listed as IOCs.

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` `2f633d8fef93e3daf9ca2d8f927cfd8de7113eb0e9e7f09db52a40108619ab98`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23237 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` `1aff71a70dca280f76d82a268ac6a09e7205579634c520c3ad09f4def098c70c`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6846 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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