PDF malware analysis — malicious · 10d629f275e77bf1

MALICIOUS

PDF

7.2 KB

MD5: 5ba8b55836ddf533613a7ec700cea66d SHA-1: 98d6b876e0607bc80de3d9627e9388f727944161 SHA-256: 10d629f275e77bf1de491c5728ba08b1a14ae5b86fcb0369a07744dfdc475fed

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains embedded JavaScript that utilizes an eval() call and String.fromCharCode, indicating an attempt to obfuscate and execute code. The ML classifier strongly flagged this PDF as malicious. The JavaScript appears to be designed to download and execute a secondary payload, though the exact URL or payload is not directly visible due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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_obj0005_000.js` `98f937bf38884e396b5029f8b41304e8b46f314407e520f0a452c4a7450b63d5`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	315 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001aa9.js` `589548fa62edefeb31af1d3a62c7ab794b879557a731b64793e1a619ca52e73f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1AA9	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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