PDF / .PHP malware analysis — malicious · 124b6e9e284fd643

MALICIOUS

PDF / .PHP

68.2 KB

MD5: e93650078d76d9f1212350b0d91b033d SHA-1: f8cdae3ec8d8fd3a958033b487048cc4707ceee8 SHA-256: 124b6e9e284fd643b0af825abe6435534ff4f122e790a4e7416b52989346924a

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a malicious PDF that leverages the CVE-2008-2992 vulnerability to execute embedded JavaScript. This JavaScript is designed to deobfuscate and execute further code, likely to download and run a second-stage payload. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the exploitation of a known PDF vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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_obj0008_000.js` `b0a1506b19916b3853d9e853209b29aa8c10124b57fcc9802ddbeb9e4282a084`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	686 bytes
`javascript_obj0008_001.js` `3e64cc3bc06e48e10a09b941ea0816d062146133bfe3ff3b2da690e1fa2bc97f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x208	69286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `ffdb3982e8ec0d48d565c594f5ed686e1a7f8fa0404aa720a860d58cee4fade2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x4C8	3252 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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