PDF malware analysis — malicious · 40dfa01a25c89c8c

MALICIOUS

PDF

4.3 KB

MD5: 05fd65f00958d8cb0e4028449029e03e SHA-1: f0839e2cafa4c51bae989e83bf7337e285cc0faa SHA-256: 40dfa01a25c89c8c1f4c6249e01a31e51f4dc83f350b83c1d3b929459beb333e

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() to execute code, a common technique for downloading and running further malicious content. The extracted artifact 'javascript_obj40193_000.js' is also flagged as suspicious due to script obfuscation. The primary intent appears to be code execution via JavaScript, likely to download and execute a second-stage payload.

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_obj40193_000.js` `c48c2274949ae4aa0683a379b9104da7ad9842883736ae16d942d15620d6a477`	pdf-javascript-stream	PDF /JS object 40193 at offset 0x136	8295 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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