PDF malware analysis — malicious · e7f6c147ed2f9b3b

MALICIOUS

PDF

26.5 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 4b97d38b6b7f4fc4551d39dbf539d0c9 SHA-1: 34e5f76fa72cab1c5fb9608674bfc653d7a2f60f SHA-256: e7f6c147ed2f9b3ba4d5075389820f4a7ebbc55e7c222f05d94e7609bf4ad3b2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `eval()` and `String.fromCharCode`, suggesting obfuscation and dynamic code execution. The primary function of the script appears to be downloading and executing a second-stage payload, as evidenced by the high-confidence `eval()` firing and the presence of a suspicious JavaScript file. The confidence is moderate due to the lack of specific URLs or further script details.

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.
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_obj0001_000.js` `052c05672d66beba3ec0b5056a1c09caba1dd8b7cd2e73a9e14b5f45726f6a0c`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	1032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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