PDF malware analysis — malicious · d41b9444d397c8d5

MALICIOUS

PDF

2.8 KB

MD5: c0e539bcad37b3f61ee0b8bf7687c97b SHA-1: c73f3a5e077980650b5e2f3f8f2ec5c507d94f40 SHA-256: d41b9444d397c8d5fd081c2e310a3efab5ed08e691c8c5178c7fd96c53133ae0

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with one stream exhibiting significant obfuscation and the use of eval() and String.fromCharCode. This suggests the script is designed to download and execute a second-stage payload. The presence of multiple JavaScript objects and the obfuscation indicate a deliberate attempt to conceal malicious activity. Due to the obfuscation, the exact nature of the payload cannot be determined with high confidence.

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_obj111611_000.js` `f2230d5ee9fbbb34effc4a8cfc5af34d8f0bfec27adae8d3155c0b113f7368fe`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `30d06470947b1e1e54fb85cbc7058c46da5225266d36becaff0cb6052216dc7a`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3338 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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