PDF malware analysis — malicious · 0ecefd707db5f13e

MALICIOUS

PDF

14.0 KB

MD5: be394e8cc5d1d659db785d36b95bf34e SHA-1: e6909e22ad1adc42d3dc203eac3491231c67eed0 SHA-256: 0ecefd707db5f13ebd2f648d01eb0cb80a5bbe67f7d5c4ea5543e4c05726c909

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript streams that utilize obfuscation techniques and the unescape() function, indicative of exploit code. The scripts appear to reconstruct and execute further JavaScript, likely to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious, and the presence of JavaScript exploits points to a common PDF-based attack vector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj3332_000.js` `4377a63b8e35fe7ea470854eb986e68dc3150cba6cbbc314f6e4bc141e506e69`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x360C	418 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj3332_001.js` `47e19bf437522f8db9934d524c913bd71854176d6feac945b0290842f0d27d3a`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x363E	482 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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