PDF malware analysis — malicious · 0bbe31c0c3b647c4

MALICIOUS

PDF

50.5 KB Authoring application: AqGCbZQBMcj3V8JS9n4ygdWh1sOw7U2m%IX5FoeTivHarEk0Kf6plPtNRxYuLzD

MD5: a2deb82da83396b0540fa5dcf569d0e9 SHA-1: f88319c8d172312b6685fe50e445b6581f447078 SHA-256: 0bbe31c0c3b647c42daeb4a6a5321c68955f0a4cfb8125ade61db4f6745f33c3

148 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes the unescape function, a common technique for obfuscating malicious code. The script appears to be designed to download and execute a second-stage payload from a URL reconstructed from concatenated strings. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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 (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.
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_obj0018_000.js` `a631433cb99af190b2cacc05617fbe7339a7aa8a5e9b471aa89a77e0be51783f`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	25294 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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