PDF malware analysis — malicious · 386bfb0425cca095

MALICIOUS

PDF

4.1 KB

MD5: cb74eec19a3b7e5d2cec7bd9fb7fe984 SHA-1: f579db628798788dc553af9b8b563e4aa3f955fd SHA-256: 386bfb0425cca095b1de95556ed60594ca008d53c648cbc1395ae338455f25f0

66 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation, with `eval()` and `String.fromCharCode()` calls suggesting the execution of dynamically generated or encoded code. The presence of deobfuscated JavaScript files further supports this. The primary intent appears to be the execution of malicious JavaScript, likely to download and run a secondary payload, though the specific target is not discernible from the provided evidence.

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` `21fc71fa5e3db26dd54cdfb676d77cd71792316505842c07bc8b01ee6f3c102e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6413 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` `e7592505d3f26e27e608794c8877a74d42bf532594e107fd4867011c9143df56`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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