PDF malware analysis — malicious · 33baaab7289fcea9

MALICIOUS

PDF

2.1 KB

MD5: 1d8df79327eb23f6204b0f522407766c SHA-1: e7e5f297c5645f45f7236bf3793bb686df4ed502 SHA-256: 33baaab7289fcea9510bff89cfc19ebb443e944ef64f579b2d31b9f3d7650fd3

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

This PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. The script also utilizes String.fromCharCode, indicating an attempt to hide its true functionality. While the exact payload is not discernible due to the obfuscation, the presence of these techniques strongly suggests the script's purpose is to download and execute a second-stage malicious payload. The extracted artifact 'javascript_obj111611_000.js' is also flagged as suspicious due to script obfuscation indicators.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x75D	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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