PDF / .283 malware analysis — malicious · 0d4510b856b0e0ba

MALICIOUS

PDF / .283

29.7 KB

MD5: 75d9a67369ac4c7858670ab1729ec9fb SHA-1: 3c22ad59ec8d0e61b9bd88d832443fa2417e6485 SHA-256: 0d4510b856b0e0ba669eb68cccd4a89a1c03557894cb52b4de1f3604ebbce56a

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample contains embedded JavaScript that utilizes eval() and appears to be heavily obfuscated. The JavaScript is designed to execute malicious code, likely downloading and running a second-stage payload. The ML classifier and heuristic firings strongly indicate a malicious PDF exploit.

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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj0011_000.js` `a894e86bd9ead0d4e3d33766b13eb6a9ccd292f7d05d773745f71c5c7ef049dc`	pdf-javascript-stream	PDF /JS object 11 at offset 0xDD	24061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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