PDF malware analysis — malicious · cf3a172d35929698

MALICIOUS

PDF

2.1 KB

MD5: 48b8c890e7523a730b1f258a28f8aab6 SHA-1: f857a89395a01442554afaa2a1e913b9f6fa0a5c SHA-256: cf3a172d35929698f5262deb576cb384acf56ac2572816184e30af9559002469

166 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1204.002 Malicious File: Malicious JavaScript

The PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscated code execution. The presence of `String.fromCharCode` further suggests dynamic code generation. These heuristics, combined with the ClamAV detection of 'Pdf.Dropper.Agent-7306188-0', strongly suggest the script's purpose is to download and execute a secondary malicious payload. The extracted artifact 'javascript_obj111611_000.js' likely contains this malicious script.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7306188-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7306188-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x74E	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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