PDF malware analysis — malicious · b2a6de5c22f3949a

MALICIOUS

PDF

2.4 KB

MD5: edb04be49cae75c0a42cb46fc2774cbd SHA-1: f1e6e5c51991794893f3ee8a9bb98ab2eb8d8a7a SHA-256: b2a6de5c22f3949ac56ba60fb143a44b20d8cb6b3611361d674bba0ef045550d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript streams, one of which utilizes `eval()` and `String.fromCharCode()` for obfuscation. The ML classifier strongly indicates maliciousness. While the exact payload is not directly visible due to obfuscation, the presence of JavaScript and the `eval()` function strongly suggest the execution of arbitrary code, likely to download and execute a second-stage payload. The extracted JavaScript files are included as IOCs.

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_obj111711_000.js` `48f8d8122973235d799e97e7cb9b2375b60655ac420effc9097cffce86b2e10b`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2452 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111712_001.js` `d4034e223aaeb0c001396f5cce054ca508714b920d7ca133787cecb5dd2f945a`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x782	633 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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