PDF / .TXT malware analysis — malicious · d3c5f35f6ef09d5a

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 12d6d48745043bd0484822ee72e03a55 SHA-1: c392cbc9437122f49d53f909885565b97792eee3 SHA-256: d3c5f35f6ef09d5a7bd9cdc18f310778ed6a39862ca27056a3395dbb786513eb

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests code obfuscation. Two JavaScript files were extracted, `acroform_b64_00.js` and `javascript_obj0013_001.js`. The primary function of the embedded script appears to be downloading and executing a second-stage payload, though the exact URL or execution method is not directly extractable from the provided evidence. The obfuscation and use of JavaScript within a PDF are common techniques for initial compromise.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `38971dc84e6a69e393cd323d4da5fa682e2b28f6e2ab17f58d30566d83e3e1ee`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6333 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `ca2b5e58051a72fd7a1b568d28b8fb371721e4b3edacd76d8f0e106c90b5640b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3597 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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