PDF malware analysis — malicious · 2f03da88e7dc9a01

MALICIOUS

PDF

4.0 KB

MD5: 9910ba599eaa3063f48ecaff05da39f4 SHA-1: a8642b35bbd82b5f3835cee8809851b85b652e35 SHA-256: 2f03da88e7dc9a0146453ca5c04acce75fede721866fbcb18728eae710da7dda

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with one stream exhibiting an eval() call and another using String.fromCharCode, indicating obfuscated code execution. The heuristic firings suggest that this JavaScript is designed to download and execute a second-stage payload. The presence of suspicious extracted artifacts further supports this. Due to the obfuscation, the exact nature of the payload cannot be determined, but the overall pattern is consistent with a downloader.

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_obj122221_000.js` `3339da08194140c483022f28eb35a20359193be358770e324ba0452cff87b52c`	pdf-javascript-stream	PDF /JS object 122221 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj122222_001.js` `a840206e60a6b9503cbe069ea34e255b0ad2d015353992f50212d4ccee288a89`	pdf-javascript-stream	PDF /JS object 122222 at offset 0x268	5522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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