PDF malware analysis — malicious · 7aeb8320808a84d2

MALICIOUS

PDF

4.5 KB

MD5: c050443533d3bbbe8024f4294accae5f SHA-1: 812c46d2cf3b1de4cf28cbc475f9c394028ffa64 SHA-256: 7aeb8320808a84d2c12d17fdbf86c577c342129c366a9dd7bed8e64c1a0c06c3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2008-2992 exploit, which uses `util.printf` to decode a numeric character-code string and then evaluates it. This suggests the script is designed to download and execute a second-stage payload. The presence of deobfuscated JavaScript files further supports this. The exact nature of the payload cannot be determined from the provided evidence.

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` `d0656d85d020a57be0caadb3421bc8a721c721345728da35626a673c521931d6`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21463 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` `1fd18939ef0d0e0cb896d918a00b386e837c6f2e038bf102ade7ecaf448f6169`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6335 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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