PDF malware analysis — malicious · be0c6741ef68d461

MALICIOUS

PDF

26.5 KB Created: 2011-01-28 10:50:15 +02:00 Authoring application: Bridge Loan Mortgage (via mPDF 5.0)

MD5: 899f51cdb92b6a444a7d945013fb09a9 SHA-1: b3458afd7a2600d2abe589ca1476b9bb08105e76 SHA-256: be0c6741ef68d4615b363abc5e50f5bfddc27d998bae47ae5cd4653c77bcad96

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The JavaScript streams are obfuscated, and the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic flags 'Hex escape obfuscation' and 'Script obfuscation indicators'. While the exact payload could not be determined due to obfuscation, the presence and nature of the JavaScript strongly suggest it is designed to download and execute a malicious second-stage payload. The document body is unreadable, providing no further context.

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 0x62D5	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 0x62D5	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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