PDF malware analysis — malicious · c555eb6a72bf3c14

MALICIOUS

PDF

27.2 KB Created: 2011-04-22 18:02:22 +03:00 Authoring application: Perkins Loan Deferment Form Wiki (via mPDF 5.0)

MD5: 8f917336b3ff772047a0c5981c1b6af6 SHA-1: 56c6ec07655dba5fa9887ea8793654ffe89e24ac SHA-256: c555eb6a72bf3c14fd8ca29c5f036acece30bc18802d43ab93a8b32d6890cddf

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The presence of unescape() calls and suspicious extracted artifacts suggests obfuscation. The embedded JavaScript is likely designed to download and execute a second-stage payload, although the exact functionality is obscured. The file's authoring application and creation date do not provide strong indicators of a specific threat actor or campaign.

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_obj0022_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 22 at offset 0x656B	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_obj0022_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 22 at offset 0x656B	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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