PDF malware analysis — malicious · 7d506761da398ead

MALICIOUS

PDF

4.1 KB

MD5: cccd6fcca2a0888162646400a82ca98b SHA-1: 145ed5d072f854112393b0d8689ae116bd89c155 SHA-256: 7d506761da398ead9bb370009c8df4bdb0d0f1975fed66b902c9e68261eb7f02

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2008-2992 exploit, which uses util.printf to decode and execute JavaScript. The eval() function and String.fromCharCode are also present, suggesting obfuscation and dynamic code execution. The primary attack vector appears to be leveraging a PDF reader vulnerability to run arbitrary JavaScript, likely to download and execute a secondary 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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `45125abf18a364ff05c8a8cb2786ab3d3053188b5a35ca277b235197851de537`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21126 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` `55f24c277cca6c6bd2adef6907ecef55939039858ef6ddcb1be7b465087d96e8`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6235 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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