PDF malware analysis — malicious · cb36790020b187c4

MALICIOUS

PDF

3.8 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 5636935753ecc397bd70483e1c52213f SHA-1: 721eb9da03e7439e8f0da80b0ce83cbfc9a47ab2 SHA-256: cb36790020b187c4657aa7e325dbb5152d5bc8e7bc5681f39a059b641a20cc54

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The presence of an `eval()` call and `unescape()` within the JavaScript stream suggests obfuscation and dynamic code execution. The extracted artifact `javascript_obj0014_000.js` is likely responsible for downloading and executing a second-stage payload. The confidence is slightly reduced due to the lack of specific IOCs beyond the embedded script filename.

Heuristics 5

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_obj0014_000.js` `ac2f4f386f8064cb5c7a84fa5cea8994be023e9240a068eccc99e88c9c20077c`	pdf-javascript-stream	PDF /JS object 14 at offset 0x368	30891 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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