PDF malware analysis — malicious · f8900d7cca2334a7

MALICIOUS

PDF

23.3 KB

MD5: 230d9c5a14b90efe08698111f7a4e823 SHA-1: 23642acaa4abb28d500e580e945192e79ce8be39 SHA-256: f8900d7cca2334a7ef64a3b91b80a8e40089b268fde5c5d4d2c387f3afa2ea3e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1566.002 Phishing: Spearphishing with Malicious Attachment

The PDF file 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 the execution of a secondary payload. The presence of JavaScript actions and streams within the PDF, combined with the obfuscation techniques, points towards an attack pattern aimed at exploiting vulnerabilities or delivering malware. 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 0x5AE5	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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