PDF malware analysis — malicious · cfb82710f2d6c80d

MALICIOUS

PDF

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

MD5: 1a90c414e3728cf6fa64f1bc2b36f4e2 SHA-1: f35b52579b93e10b7bcf94d72eac24341400bb2d SHA-256: cfb82710f2d6c80d9c6e61c4d7b8fa78c7a3f3f14ad4ac0bc4e42d481b3ab40e

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and ML classification flagging it as malicious. The JavaScript appears heavily obfuscated, making precise analysis difficult, but the presence of eval() and the ML score strongly suggest it's designed to execute arbitrary code. The extracted file names 'javascript_obj0013_000.js' and 'javascript_obj0013_001.js' are included as IOCs, representing the obfuscated script artifacts.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_obj0013_000.js` `657fd114b6838d4b9c9151d0b7dfd588d061446667487b960d9e06caf9df226c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	9528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `39ccbe046bceeab1b248398de3314efa513be3253171b37004c3147d2d28df3b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x358	10234 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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