PDF malware analysis — malicious · d06209bfe9024d95

MALICIOUS

PDF

4.9 KB Created: 2010-07-30 08:34:51 Authoring application: Qoperohaxomauecoviy (via 12c6bRiniuaruijoxe)

MD5: ee91304421bfae72cbcbcec198196208 SHA-1: ab1311ffe5b02527b3d6d040bb799c4efd7142f8 SHA-256: d06209bfe9024d95b2661fd15913dd59c5feab55cfeb8433e3c552caf38b8f6e

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', 'PDF_EVAL', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The ML classifier also flagged it as malicious with high confidence. The embedded JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for executing the malicious payload. The exact functionality of the script is obscured, but the presence of eval() calls and stager techniques strongly suggests it's designed to download and execute further malicious code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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` `102bd53c3d5aca19d3fddf2959dd86439856f01b130576912f06ee24f2e34ef8`	pdf-javascript-stream	PDF /JS object 11 at offset 0xE66	487 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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