PDF malware analysis — malicious · 44c3947fbf8ebc69

MALICIOUS

PDF

4.7 KB Authoring application: Fesafahahuekemoj (via 0d31aG meweqihyl)

MD5: 9c92746bd8562ce0161d8db1007dc047 SHA-1: 6d98b8b0120817693eeb78b1bdc28965734ceb16 SHA-256: 44c3947fbf8ebc69639fdbb9baf27f58e15fb0074f1ee6e3224af6887d3a3d30

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence PDF_PAGE_WORD_XOR_EVAL_STAGER rule indicates that this JavaScript is obfuscated and designed to execute further code. The PDF_EVAL heuristic confirms the presence of an eval() call, which is commonly used to deobfuscate and execute malicious code. The extracted artifact 'javascript_obj0010_000.js' is likely the deobfuscated payload or a loader for it. The primary intent appears to be downloading and executing a second-stage payload.

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_obj0010_000.js` `ee917d6393e01e6ad2c20686aa47d42b3a5a63c09aaed05bf36b1fc92d87b5df`	pdf-javascript-stream	PDF /JS object 10 at offset 0xE15	489 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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