PDF malware analysis — malicious · 75b22d8971603094

MALICIOUS

PDF

7.3 KB Created: 2009-12-17 16:59:10 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: a3573a8c382114ff8659acd5c20a6bbc SHA-1: 26bf60be5c69799ee93915933123acb0b9376922 SHA-256: 75b22d8971603094f9333bfb3a7d5c06ae9d5b14a45c674d5ec7d3b33d841eac

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains embedded JavaScript that utilizes eval() and unescape() functions, indicative of an exploit. The script attempts to execute a Base64 encoded string, which decodes to 'this.media.newPlayer(aaaaa);', suggesting an attempt to trigger a media player exploit. This exploit cluster is highly likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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)
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_obj0021_000.js` `346a64d842a9cf36b501736cd371d697e13a5b53d3b3ef524a1897fae3c4f89b`	pdf-javascript-stream	PDF /JS object 21 at offset 0x1883	466 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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