PDF malware analysis — malicious · e5d549fd906a2ee1

MALICIOUS

PDF

26.3 KB Created: 2011-01-24 17:01:48 +02:00 Authoring application: Student Loans National City (via mPDF 5.0)

MD5: 6031f788b1f0a41b7ad943a197a35197 SHA-1: ca3de796f481ff591bcb06c530b3be1d1cfd5e24 SHA-256: e5d549fd906a2ee1838daf160947989e77a400bede723fa7bf638c60b97048db

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript streams that are obfuscated using `unescape()`. These scripts are likely responsible for executing malicious actions, such as downloading and executing a second-stage payload. The presence of multiple JavaScript objects and the use of obfuscation techniques indicate a deliberate attempt to conceal malicious activity. The file's metadata and heuristic firings strongly suggest a malicious intent.

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x612B	136 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 hex-escaped blob(s).
`javascript_obj0020_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 20 at offset 0x612B	134 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 hex-escaped blob(s).

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