PDF malware analysis — malicious · a353c351f6b2e121

MALICIOUS

PDF

5.0 KB Created: 2010-08-01 07:24:19 Authoring application: Hyviqonazipa (via 570b3Hitardesozoweq)

MD5: d7cca47f7b37b6e5f28b0e3e8672ab31 SHA-1: e0d8f954989c26b185ee12520b2368dfae4776cb SHA-256: a353c351f6b2e1219518fb885807336fe180ac93ca623e1b546ab4f760d03e13

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic indicates that this JavaScript is designed to launch a secondary payload. The ML classifier strongly supports a malicious classification. The extracted artifact 'javascript_obj0011_000.js' is likely the stager itself, which is expected to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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 1 related finding 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.
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_obj0011_000.js` `570ce70ed7a43c6e1927e21ed2d859a652b5905478e192c8b3e32f233141b7a1`	pdf-javascript-stream	PDF /JS object 11 at offset 0xEA4	540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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