PDF malware analysis — malicious · 6814a9434a0a3630

MALICIOUS

PDF

4.8 KB Created: 2010-07-21 07:46:09 Authoring application: Hsooikakawi (via 27390Cisdiqlis)

MD5: 035be1322e7e4f784018f1ec9030282f SHA-1: 17a518087bbf8b4b91e607a4b142598a843cb634 SHA-256: 6814a9434a0a36308da272bf5de90fabda60b2502b1c3c55d955f46e64cc1b26

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, identified by multiple heuristics as a stager. The script attempts to deobfuscate and then evaluate a string, which is likely a second-stage payload. The ML classifier strongly indicates maliciousness. The primary IOC is the embedded JavaScript file.

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 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` `6ae39831e4108dcc14a2affc3389b3e23c056f5b78cc13fa9d5bdf4725884edb`	pdf-javascript-stream	PDF /JS object 11 at offset 0xE36	532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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