PDF malware analysis — malicious · c4c1e4e56f275adb

MALICIOUS

PDF

2.5 KB

MD5: 7c2fce5fc6915d209bfbfaf0932cca49 SHA-1: 25486592fa2a5e958598d12c7a9a3174edb4fbbd SHA-256: c4c1e4e56f275adbb565184960d3f53c8a720540f237ec503a16b18c9a5e58d1

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. These heuristics indicate that the sample is designed to execute arbitrary code. The presence of two extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', further supports this, suggesting the script's purpose is to download and execute a second-stage payload. The document body content is unreadable and does not provide further clues.

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` `47c0d540c87ea4f24357f04167cb99e0bee437fb73c75cdcc6af6993047fc49c`	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` `4ea4f746da5dded24fc71530a405ad6797a4cbeae529d8b7e5fbc5e876b3f835`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3295 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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