PDF / .TXT malware analysis — malicious · 7d8b5aad46d127c7

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 768edec6dd965fba1906ebc2bfcb88cc SHA-1: 067368b8dd1b922d0394fbdc2f12b4b21567c42e SHA-256: 7d8b5aad46d127c7f4ab9ca5b2bb5478ac0335cffe15c4807f640026775e15b7

68 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 obfuscated JavaScript code designed to execute arbitrary commands. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for the malicious functionality, potentially downloading and executing a secondary payload. The lack of specific indicators for a known family leads to an 'unknown family' classification.

Heuristics 6

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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `3549ab081ab1648a95ec8853605050d2ed30311485fa3ab01e1ab96885df285f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 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` `92b56da3693b02c69f6102bc22f0ac246a6d9037fdbe77dea52746d9655d91bd`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3606 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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