PDF malware analysis — malicious · c9444b0f4e98e377

MALICIOUS

PDF

23.2 KB

MD5: 6406e93306fab915953fdde99a813c66 SHA-1: 4b735005cea31a1130163c58e08923d4e9c8d7ca SHA-256: c9444b0f4e98e3773094df739fb127d62ae9d3d6ad74466dff2f7e3816dd74e5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information T1204.002 Malicious File

The PDF file contains embedded JavaScript, which utilizes `eval()` and `unescape()` functions, indicating obfuscated code execution. The presence of `String.fromCharCode` further suggests dynamic code generation. The primary function of the embedded JavaScript appears to be the download and execution of a second-stage payload, as evidenced by the suspicious extracted artifact `javascript_obj3332_000.js`. The PDF also employs ASCIIHexDecode and ASCII85Decode filters, which are often used to hide malicious content.

Heuristics 8

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)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `e6614c6c268ebf6c00969675a0789fa767b85f13cc344a5c5782c7739004cd30`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x5AB1	182 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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