PDF malware analysis — malicious · 1d3bd931ef2a7ae7

MALICIOUS

PDF

8.2 KB

MD5: 95a930e8b814ef0b79fe7a47bb45f02e SHA-1: 6f57a32d4b0ed2618d8e4924d958b67afcc0f927 SHA-256: 1d3bd931ef2a7ae735050d73dc3a555d8b31e9a7eb1cfcce71e4543313a83074

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Scripting T1204.002 Malicious Link/URL

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2008_2992' heuristic specifically mentions the use of 'util.printf' for string concatenation and decoding JavaScript, which is a known method for exploiting PDF vulnerabilities. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', likely facilitate the download and execution of a secondary payload, contributing to the malicious nature of the file.

Heuristics 4

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `72ef9ff1df0f9adf149fd061ae7fef8cac34e8e2c3f6f80c9a23845a79f11989`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	53 bytes
`javascript_obj0013_001.js` `bc9c0da0f1a8d150458bbe0a36babacf5a831b9dd777b89883d733df7388a137`	pdf-javascript-stream	PDF /JS object 13 at offset 0x381	16789 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `71aff3d3b99e74cf46da588d9da0694643c4933be336f3a730f7bae0af782f27`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x381	2102 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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