PDF malware analysis — malicious · f6c9583b5e426654

MALICIOUS

PDF

4.0 KB

MD5: 6efed500ecfc6b64e58c7bbfb8038480 SHA-1: c297ae42d392bc9b046cd12dd8236efde9fb8bbd SHA-256: f6c9583b5e42665471fa070cfa070b8fc2a930647c510ba7ca70bd4d29f487b0

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. Specifically, the CVE-2008-2992 heuristic highlights the exploitation of a vulnerability that uses `util.printf` to decode and execute JavaScript. This script is designed to download and execute a second-stage payload, as evidenced by the extracted JavaScript files and the nature of the exploit.

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)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `c49e035f940bb4670bb2c470ce9abbca5dfd4e8e1022d0b6c2c72a2aee7bd520`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	19694 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` `3a5253854358fa60ae35d58ff2295d3c2ed4ed232b6887189829a370b752ae9c`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5816 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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