PDF malware analysis — malicious · 61698005cc0eb1cd

MALICIOUS

PDF

8.4 KB

MD5: 6e4c264de0d00799263d51c95c1d5582 SHA-1: c7f336d20d8d260dcfaa99bbec0e393a24140631 SHA-256: 61698005cc0eb1cd2e2ed7f3bb275d08bf51b3f8e573f2020aeaf828ba9551af

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that uses eval() and String.fromCharCode() to execute obfuscated code. The script attempts to decrypt a string, which is then executed. This pattern is commonly used to download and execute further malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `1411a8a908cd328eb4bc7eeb2696ac195cb726bf5801802150f18548859624c7`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001f65.js` `d241f622363b88632a4209e045186dc0ff9129a25d89e879e9b884c4a6e9fdb1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1F65	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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