PDF malware analysis — malicious · 95cf7f71ddf3cba4

MALICIOUS

PDF

4.3 KB

MD5: d58e8e5977064a90c78b9340b3f6eee8 SHA-1: 34daa4dd2215d406e3f727ff8498933639df8cf6 SHA-256: 95cf7f71ddf3cba4d145c8205b16ce167745208fa863c973a5f3d34177541249

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2008_2992 firing suggests the use of a known vulnerability to execute arbitrary code. The embedded JavaScript, particularly the deobfuscated 'numeric_charcode_stage_000.js', likely attempts to download and execute a second-stage payload. The presence of eval() and String.fromCharCode() calls within the JavaScript further supports this, as these are common methods for obfuscation and dynamic code execution.

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` `acf7bf37fe98f113caafc5de8d1bbf65de41539cc6c25b1f780163064e9485b8`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22164 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` `a36c3c551db796d1af7ff3c15f7c715544dac58d83a787697c19118338d03b80`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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