PDF malware analysis — malicious · 4dbcdb98895f68ae

MALICIOUS

PDF

8.3 KB

MD5: cb75da3cf3fab17eb1687591be426ee1 SHA-1: 9aa9501166c37f378eadd065d47a9c3ca83db82c SHA-256: 4dbcdb98895f68ae2fc81d76f357f20e8b66424a6f8063f5280b801747e74587

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The ML classifier strongly flags this PDF as malicious. The primary intent appears to be downloading and executing a second-stage payload via the obfuscated JavaScript, as evidenced by the embedded javascript_obj0013_001.js artifact. The exact payload and download URL are not directly discernible due to obfuscation.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `51b84bd676691b386536c83dd7b3ca36e29711a1b41b6583c2714539ad7b6b8f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	14453 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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