PDF malware analysis — malicious · 299bb155c570efda

MALICIOUS

PDF

4.1 KB

MD5: 0a4788f0baa7a63d46fbfabf9a6ca561 SHA-1: 2306cd18743b3dbc5f175bc37a9333afa028e441 SHA-256: 299bb155c570efda2ba4460ced26e62986fd2f2fa01280897b2b132715823b1b

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 presence of PDF_EVAL and PDF_FROMCHARCODE suggests the JavaScript is obfuscated and uses eval() to execute code, a common technique for downloading and running secondary payloads. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted, but its content was too obfuscated to determine the exact payload or destination. Therefore, the specific family is unknown, and confidence is moderate.

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_obj0013_001.js` `534169acb6829a6a1727c172369c1abbafb693c7ae7188bac08dfb4b80d33cb9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6401 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `9f855ce472a01da094c7a8744de7914756d1aa80d0425e156f834353bcffe043`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3648 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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