PDF malware analysis — malicious · 6fe527dd3a4d8b21

MALICIOUS

PDF

2.6 KB

MD5: a11bbae6285dda6ae895a597253577ac SHA-1: a7819b6f91cc40f01fcf3802db96b688f91cc652 SHA-256: 6fe527dd3a4d8b21b964acaa11c5d0ca3d126a2bff4f58151444beba95e70fcd

66 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a javascript_obj0005_000.js artifact. The JavaScript code is heavily obfuscated using hex escapes, but its presence strongly suggests an attempt to execute malicious code. This is further supported by the ML classifier flagging the PDF as malicious. The primary function of the script appears to be downloading and executing a second-stage payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 3

Suspicious extracted artifact medium 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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `a9628dd8bebd0f1dc85ad6893c1b61d5b74565a2c358a9766f3c7a6d875db862`	pdf-javascript-stream	PDF /JS object 5 at offset 0x213	11004 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long hex-escaped blob(s).

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