PDF malware analysis — malicious · 2cbc9d2c847ced23

MALICIOUS

PDF

2.8 KB

MD5: 27c332eb6a69141274882091ece30ac5 SHA-1: 642a8eae86b4388e81fb802c86dd486ef2d9c3f5 SHA-256: 2cbc9d2c847ced238b364a8ee3ab8ec77026e37481f3d534d0ee81ed1292c834

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscated JavaScript code is being used to achieve malicious objectives. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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` `afb1d92109f589f6e8343268341356238fddd7f0947c6283a29dff864ee40d7a`	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` `1b43385e99e30751dd1fb4b4dbbb461a90113edaab03ed0a20610b9583ff0626`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3363 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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