PDF malware analysis — malicious · b8f0f5424ec1a3a0

MALICIOUS

PDF

22.5 KB

MD5: 7c48025b3b90b2deaddf6c89518599e6 SHA-1: dd7ffaaa09131f16cd1017f03fb1254731006e37 SHA-256: b8f0f5424ec1a3a0906c8a09812286baaa57e1b3ddc7227ee48f9a9c1fb500c7

134 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() functions, along with String.fromCharCode. This obfuscation is a strong indicator of malicious intent, likely to hide exploit code or a downloader. The presence of these JavaScript functions and obfuscation techniques points towards an attempt to execute arbitrary code or download a secondary payload. No specific family could be identified due to the heavy obfuscation.

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` `41b85b352566cdf5433d1a43e699608832fbd07da1d5ce3e5141aea5b1c53f26`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x57ED	252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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