PDF malware analysis — malicious · b18ac83946646868

MALICIOUS

PDF

4.0 KB

MD5: f2dcf014297eee652ef611d9c4c2e11b SHA-1: f14305cd4ecaa4a835e463233a2796617d0fd8f4 SHA-256: b18ac83946646868996005921cc5049e2967fdd1f243a709a1db089595730372

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics suggest that the JavaScript is obfuscated and uses dynamic code execution. The ML classifier strongly flags this PDF as malicious. The presence of deobfuscated JavaScript files ('acroform_b64_00.js' and 'javascript_obj0013_001.js') further supports the analysis. The script's likely intent is to download and execute a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `7d8b659c961786788e91db71df31206dda6db7b5bca7668a1f2b29ffd8298966`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6365 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `7155887ffeada821ad92ad708d5b57442c1f1a1c3d23cf3886e6de116a937952`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3620 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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