PDF malware analysis — malicious · a439b51ee91b7cc2

MALICIOUS

PDF

4.1 KB

MD5: 2d090c3b6c2175d95cd820bec4e7c87b SHA-1: f2311b91b974660a0b0aa091ab043445ad0de934 SHA-256: a439b51ee91b7cc2b4b373dc2ccbc1d3b362fbb31be8cb9d7e1ce4b9b58013cc

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is executed using a known vulnerability (CVE-2008-2992) that leverages `util.printf` and `eval()` calls. The deobfuscated JavaScript stream, `numeric_charcode_stage_000.js`, indicates a complex script designed to download and execute further stages. The presence of `String.fromCharCode` and `eval()` suggests a downloader or dropper functionality.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `497abb6a52a50b6e88947bf7ec1481d43311798104cd2b8d74104c949f1c448c`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20649 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `3dbf0720229088c43b94b139a308c054f7bb82906131b801264f7e701b9b3453`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6078 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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