PDF malware analysis — malicious · 2b10a4b12be4e9f4

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 1e75bddb169304d5b2358953b0d483ca SHA-1: b2bca05a54371f2565aa74de79a2ad3186b40f0b SHA-256: 2b10a4b12be4e9f4597a5f82c2f758a76178a11acca37b2d355dc36f50cefb8f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, indicated by the use of String.fromCharCode and eval() calls. The ML classifier strongly suggests maliciousness. The embedded JavaScript file, javascript_obj0001_000.js, is the primary artifact and likely contains code to download and execute a secondary payload. The confidence is slightly reduced due to the lack of specific IOCs like URLs or hashes within the provided evidence.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `352592b7f6a532c4e79805c42c2f3823520a1e94f720026a4fb3294f227e4a25`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	967 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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