PDF malware analysis — malicious · 253b150be123ff0a

MALICIOUS

PDF

4.0 KB

MD5: f1449fcb7903413b09ec1c82a448df67 SHA-1: 81a12a5b2436ef6d28f21476d2a1667d22dcf1f7 SHA-256: 253b150be123ff0a51d79eb75f6fb64ceb8f57b99c80912b426ff35446c30c4b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly flagged this PDF as malicious. The presence of obfuscated JavaScript streams, specifically 'acroform_b64_00.js' and 'javascript_obj0013_001.js', suggests the execution of malicious code. The 'eval()' call and 'String.fromCharCode' usage within the JavaScript point towards dynamic code execution, commonly used to download and run further stages of malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_001.js` `45341a2ceb955e761528c438bef89a90e62be5a44dac8914962aac63117f4885`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `449da1eb7179308960d7f46669a2354dd1d424c362a99198be82c8c65ff9661c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3611 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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