PDF malware analysis — malicious · c70e236695633b89

MALICIOUS

PDF

4.0 KB

MD5: 34d7abb0952c074d92f37f644c9a606d SHA-1: 3683136a04df4e4b9012ce2cbfa3840b5c371a7c SHA-256: c70e236695633b8918a28ccf48c46a35c33ee72c9aac4da36c942bf5d3ef04d2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The 'eval()' call and 'String.fromCharCode' usage within the decoded stream suggest obfuscated code execution. The presence of deobfuscated JavaScript files ('acroform_b64_00.js' and 'javascript_obj0013_001.js') further supports this. The script's likely intent is to download and execute a second-stage payload, although the exact mechanism is obscured.

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` `77bdfc699d45bbd81f5772b40c06f4211b0ea0ff0c7925b1198a0abb9de7ed26`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6313 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` `2386924b43b16af1756a85d08c1a64c4b9c62f412ba23d4b800acf0de938f34c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3582 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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