PDF malware analysis — malicious · e0b38d2ded12d0b3

MALICIOUS

PDF

4.2 KB

MD5: 6b1dc835de70c2909fcb7b735e21167b SHA-1: 817a2b309dfd8a0fc18d7a7d624f8023bf16fbdd SHA-256: e0b38d2ded12d0b33bd5e5409d8e0b60250c44ae59775da78ead067afd654fad

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic confirms the exploitation of a PDF vulnerability via JavaScript. The embedded JavaScript streams, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a secondary payload, which is a common technique for initial access.

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` `252a50389d3dc9e4c5914c59c654f1fdb9eda9b1459443faa627b2f415675404`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20376 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` `fd6dfb8e064360e55c7389b2f50e2b93143ff30ab95f700b2285a9c20b8764ab`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6002 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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