PDF malware analysis — malicious · 1e98cd8dce7d1dbe

MALICIOUS

PDF

22.6 KB

MD5: a6486c86240d8c63bb68c231dca563bd SHA-1: ba7bf9027eca403a96c0879c26dc70ad8143606c SHA-256: 1e98cd8dce7d1dbec9933dc94b71a4a1b132b56738662cc7d11287ac66fed575

134 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. This obfuscated script, named 'javascript_obj3332_000.js', is indicative of a downloader attempting to fetch and execute a second-stage payload. The use of ASCIIHexDecode and ASCII85Decode filters further suggests an attempt to conceal malicious content within the PDF structure. Due to the obfuscation, the exact nature of the payload and its delivery mechanism cannot be definitively determined.

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` `a105524e6b35a3c7073fa1b7ddac1213d09b678be79c3d2a6932bf8e2a597a30`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x57DB	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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