PDF malware analysis — malicious · b6f2d441d28c7f97

MALICIOUS

PDF

4.1 KB

MD5: 3f2d082b9a27c265499f49177a3bfa4a SHA-1: 83b7f809e3016ff5f64258469db74d06e8f6080e SHA-256: b6f2d441d28c7f97991d34fc88a334d1e3bb6427d740210ea9cc3527d594bf15

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode() functions. A critical heuristic identified CVE-2008-2992, indicating the exploitation of a known PDF vulnerability. The deobfuscated JavaScript, named 'numeric_charcode_stage_000.js', is likely responsible for downloading and executing a second-stage payload. The presence of these elements strongly suggests a malicious intent, likely involving the delivery of further malware.

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` `c699d2338f1d096377c3f5364135808da1c79b484388c7c187eebeda35147d03`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21127 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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