PDF / .TXT malware analysis — malicious · ff488a2a3161e719

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 526c1b675cd676d4eef296fac55c4d56 SHA-1: acbc866491c6e2b8d8207dc36675bc192c21beae SHA-256: ff488a2a3161e719965d6dbe20294ab08062f99d9d7f2a8b61b158eda6c250b5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple PDF-specific heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The deobfuscated JavaScript stream, named 'acroform_b64_00.js', likely contains code to download and execute a secondary payload. The presence of 'eval()' and 'String.fromCharCode()' further suggests dynamic code execution. Due to the obfuscation, the exact download URL or execution method could not be definitively determined, leading to a moderate confidence score.

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` `0bccc4f237de1b8ff28c7a506514dd07c3cf9f33b105216c6b3d3ff9f6223940`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 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` `5bf06c1025440057e5503683f5ee4cb73b8ca78101e1d4c3e5a1a4e016e53e7f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3575 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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