PDF malware analysis — malicious · adc9652439a3aecb

MALICIOUS

PDF

4.3 KB

MD5: 42e26ec875cb4c7eeb8c8669eca7058a SHA-1: f64954e9b701e9925f81ce75b5a3d12527d27fb8 SHA-256: adc9652439a3aecb60de9b8c93e79d5f5bc0047ebbaedb9c793bc81aee4c9329

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the JavaScript stream suggest obfuscation techniques are employed. The extracted artifact `javascript_obj423185_000.js` further supports the presence of script-based malicious activity. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload, although the specific payload and its destination could not be determined 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj423185_000.js` `413f23a60506378ae24e71a963a16dda10134a61e37e07b81b1ef1ed912e2ad8`	pdf-javascript-stream	PDF /JS object 423185 at offset 0x135	8294 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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