PDF malware analysis — malicious · 26fb62513b04ba2e

MALICIOUS

PDF

12.8 KB

MD5: fe991aebfa12fcaacf8abbb410ab4feb SHA-1: d8dc97d91a8d0e05d86f548a0dc8eb43a6dcf653 SHA-256: 26fb62513b04ba2ec7671eaa66bbb7a4edce27ef825d00ecfdc63faace0957a6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call within the JavaScript stream (PDF_EVAL) and the use of String.fromCharCode (PDF_FROMCHARCODE) suggest obfuscation and dynamic code execution. The primary function of the embedded script, javascript_obj0004_000.js, appears to be downloading and executing a secondary payload, which is a common technique for initial access and further system compromise. The confidence is moderate due to the obfuscated nature of the script.

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_obj0004_000.js` `40eee78a1045c00fddba45177c39a208abcd57afea6e8ae43b6dddf0e4fcd2ee`	pdf-javascript-stream	PDF /JS object 4 at offset 0x1A6	55516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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