PDF malware analysis — malicious · a221966cba8b4a05

MALICIOUS

PDF

2.7 KB

MD5: 453847cb3c75b15a9238faf268987b34 SHA-1: b3a63c55101db19ce81551591c15dd9f1490c1ea SHA-256: a221966cba8b4a0529203973c6749f308b766620c62ead3f9d4f35c72a701f09

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream appears to be obfuscated, making a precise analysis of its actions difficult. However, the presence of eval() and String.fromCharCode() suggests dynamic code execution, likely for downloading and executing a secondary payload. The extracted files javascript_obj111611_000.js and javascript_obj111612_001.js are also flagged as suspicious.

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` `2a93f14458d40c0b58e4aaf6e054e055f559f372f5844087798018e54596f7c0`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `04c23feb345d998902565979738c4c45e0044171624a04a9d3169d182abe9bda`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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