PDF malware analysis — malicious · de4c5ce108c686db

MALICIOUS

PDF

6.8 KB Created: 2010-09-13 12:13:16 Authoring application: Qggewasdebo (via e1dc0Casiwajiomidox)

MD5: 1e8cefee10d17124e622101f5fc25bed SHA-1: 3c8295b38207e070a7da531f182f7e797f7e66b5 SHA-256: de4c5ce108c686db79c03eb50e09a9180a79cbcbb572d14e9337b62224ee6679

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further confirms its malicious nature. The embedded JavaScript is likely used as a stager to download and execute a second-stage payload, a common technique for initial access.

Heuristics 4

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `4ed0e25cb988f785847231ed349ce1e5f2b9cb2b6f573c0a3462080817722f94`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1301	1732 bytes

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