PDF malware analysis — malicious · 21524d08e59c1a77

MALICIOUS

PDF

5.1 KB

MD5: 619835a80ced0b7aa888af83bc4b0c70 SHA-1: 273ce0376aa898a1aa929993a1ee8549be1a8ecc SHA-256: 21524d08e59c1a771fea9e2bbd2c3d07820ae9074dc72b57051b353d09b98c4d

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 JavaScript stream utilizes eval() and String.fromCharCode() functions, suggesting obfuscation and dynamic code execution. This pattern is commonly used to download and execute a second-stage payload. The high confidence is due to the clear indicators of malicious JavaScript execution within the PDF structure.

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_obj3016_000.js` `3e78a2331d64fc22cd76961437012151856ffffc5c7b443d248fae970ca6f8b8`	pdf-javascript-stream	PDF /JS object 3016 at offset 0x136	8369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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