PDF malware analysis — malicious · 467e3afad5ae48a7

MALICIOUS

PDF

4.2 KB

MD5: 794f8b5aa219e159fcd4674173ded9fb SHA-1: 10bf2def3697013f53dbc4643ce19aa05efbaf1a SHA-256: 467e3afad5ae48a79e869bb19520cbedeb8a29eaa481ab6c45f366692a0f1339

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The critical CVE_2008_2992 firing suggests exploitation of a known PDF vulnerability. The embedded JavaScript streams, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a second-stage payload. The obfuscation and use of eval() and String.fromCharCode() are common techniques for evading detection.

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` `96abe1b253e66e4b131c86d3cf5a89f3810438f33212dd39ddcbe7b965baecb2`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21135 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` `8f93c15c7e04bdd4963cdc13f2c5e1d4500e3e490eb91f13f0bbd22ac65eed90`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6241 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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