PDF malware analysis — malicious · 7aa941a1ef7a284b

MALICIOUS

PDF

4.0 KB

MD5: e1adf31c1b164d247ef5b46bc7f92085 SHA-1: bb0fd792908cc0f69c37defb45652603a656d405 SHA-256: 7aa941a1ef7a284b08f48b3df9f77cddbcc0643a0cbb7f39a08cfa799df11068

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream, specifically 'acroform_b64_00.js', appears to contain obfuscated code utilizing eval() and String.fromCharCode(), suggesting it's designed to download and execute a second-stage payload. The exact nature of the payload is not discernible due to obfuscation, but the techniques used are consistent with PDF-based malware delivery.

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` `17cd858f5b798ebe8d0e300c482c9c56f9533ac67aafc8a6d5b9311d52e3771d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6377 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` `0c39bc7207586eabf9f6fe20d3a801b7a363925b246ac7676e54e61482a1608a`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3630 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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