PDF / .PHP malware analysis — malicious · 5c6951e3b420a2fe

MALICIOUS

PDF / .PHP

14.6 KB Created: 2010-02-01 01:06:08 Authoring application: KOkhUFRvmgUqO (via aBoWgmAvDRqsQrvJE)

MD5: f4f837d83cabce01faebd633ec2d04fa SHA-1: fd1143eacec293b4916a34691e35ec671949c53b SHA-256: 5c6951e3b420a2fe358d31e03402afe0754c6df8b06a128dc8a00c6c406d899d

108 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript which is obfuscated but appears to be designed to download and execute a second-stage payload. The script uses string concatenation to construct parts of its functionality, including the string 'fromCharCode'. The presence of embedded JavaScript and the ML classification strongly suggest an exploit targeting PDF viewers.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Exploit.Agent-12711 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-12711
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `f8e00ab78f38b84cfd6f220dd3b05c5c52be68ab35b0ef0f6df9ea078620a8c6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x335	13452 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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