PDF malware analysis — malicious · bae1a09abb527a89

MALICIOUS

PDF

4.0 KB

MD5: e7b3dbec2f6ad518bc635cc09dae994d SHA-1: 15e587731d1cd7b7cbf91630b2068dd24a0629ba SHA-256: bae1a09abb527a8977023419ae75fa3d946c869b10e1e9a023d387e24d2af8c2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. High-confidence firings for PDF_EVAL and ML_NYX_PDF_MALICIOUS suggest malicious intent. The presence of obfuscated JavaScript streams, specifically 'acroform_b64_00.js' and 'javascript_obj0013_001.js', points towards the execution of potentially harmful code. The ML classifier's strong positive output further supports the malicious classification. The script's obfuscation and use of eval() suggest it's designed to download and execute a second-stage payload.

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` `a15dfbd0d134b899c88f930f103ff4d4154549c42706a4df4e145ba5c573e965`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6257 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` `4b92c13456de53dd3202ed3038c282a87e6790c600f066200fda96c80cf24ce1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3539 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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