PDF malware analysis — malicious · be0a77c93fb9dd05

MALICIOUS

PDF

4.5 KB

MD5: 3e52027657b6cd58936b778863de6ec6 SHA-1: 13429c1ff68cab0fe6aef42a367ad340900577a4 SHA-256: be0a77c93fb9dd05dd8f48bf22920bfeee19dc4e4eb7a0ab9bd8200f07daa545

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript, with critical heuristics indicating the use of eval() and String.fromCharCode, alongside a specific CVE-2008-2992 detection. This suggests the JavaScript is obfuscated and designed to execute arbitrary code. The presence of two extracted JavaScript files, one labeled as deobfuscated, further supports this. The primary intent appears to be the execution of a second-stage payload, as indicated by the CVE-2008-2992 heuristic which describes a PDF launcher concatenating info fields, extracting characters, and evaluating the result. No specific family could be identified.

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` `6c3f128d01ba0101fd74a785c623264ea70057d6b64e7879afc4bb40a1fc544a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	24314 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` `709f906212d1e67d104d8d21faf6b22c339b997100bc48a70c47b27c9bde31b9`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	7120 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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