PDF malware analysis — malicious · c6e476e11dbe0c8d

MALICIOUS

PDF

2.1 KB

MD5: 4b2880ac55c8a653560d765f8b08e43a SHA-1: db766fee43c6bfabbfac6e2dd86351be3f8e9309 SHA-256: c6e476e11dbe0c8d9505b9dc7a4f65de43f970655bbf6cfde0a50456f81e6614

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1059.007 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. This script is designed to execute arbitrary code, a common technique for downloading and running further malicious payloads. The presence of `String.fromCharCode` further indicates obfuscation. While the exact payload is not discernible from static analysis, the overall pattern strongly suggests a malicious downloader.

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 0x744	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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