PDF malware analysis — malicious · 5334347193c980bb

MALICIOUS

PDF

7.7 KB

MD5: 998c167b37acd611868a8df1bbd8af73 SHA-1: 61bef9ae184a13ca4b79e69ec061fb9cb3db4685 SHA-256: 5334347193c980bb5d382df922993766edc76653aee01efcbe93305094e5107a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF 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 extracted JavaScript files, 'javascript_obj0004_000.js' and 'stream_002_off00001cc2.js', are likely responsible for executing the malicious payload. The exact nature of the payload is not discernible from the provided evidence, but the techniques used are consistent with downloading and executing further malware.

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_obj0004_000.js` `abe87de1fd95245ab26cc8ae229c37c649448c1fa9e10fe7781ca87258e38301`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001cc2.js` `12f2b8681aa5bb43c7a08f140b65245d5d07b8322738f49d606197d38e537e4c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1CC2	301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.