PDF malware analysis — malicious · a72d43f925e36c09

MALICIOUS

PDF

23.1 KB

MD5: c69174ed56f4378f0011aa02a43565d0 SHA-1: d1ce47e0c7962274fb8b11b1debf5177b4784c6f SHA-256: a72d43f925e36c091f78a6db148e5c53018dea44a0356baacc707eecf1b57b22

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript which utilizes eval() and unescape() functions, indicating obfuscated code execution. The script is likely designed to download and execute a second-stage payload. The presence of ASCIIHexDecode and ASCII85Decode filters further suggests an attempt to hide malicious content. No specific family could be identified due to the 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_obj111611_000.js` `458486efaac72fcc281d53fcd971a3a09241fcc29a48004db3c406643a4a2a8d`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x59FF	246 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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