PDF malware analysis — malicious · 03b01c55ed18bf7b

MALICIOUS

PDF

35.5 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)

MD5: 1d7dba94ee1843321af6a6b593c3b8c6 SHA-1: b57ffbedf154afcf5aa7e944a115c1705ce0c07b SHA-256: 03b01c55ed18bf7b46b84790a9359d7939057d4c45d70dd494329760b246afad

188 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains heavily obfuscated JavaScript, indicated by the PDF_JS, PDF_EVAL, and PDF_UNESCAPE heuristics. The ML classifier also flagged it as malicious with high confidence. The JavaScript streams are likely responsible for exploiting a client-side vulnerability to execute arbitrary code, probably to download and run a further payload. The presence of JavaScript points to T1059.007, and the exploitation itself suggests T1203. Given it's a PDF, T1566.001 is a likely initial access vector.

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
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `37a80bd3b5fd5d9c979a0f3f110a5da8b31707473befcc56762bd3b3aeca3bff`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `74c6e04d8549d8403472bd70ffa5601cbc1e48084cd2f94cd2ff167def041b20`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35039 bytes

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