PDF malware analysis — malicious · c3119e8ffa5dd8ad

MALICIOUS

PDF

4.0 KB

MD5: 45b95a5bdd4b19d373665eb99c848289 SHA-1: 48224cb815de9656a0d94d20e1769a7e4d7cfcac SHA-256: c3119e8ffa5dd8ad4467117ecd17efc723617aeb0dc6e8edec74c491b70649ab

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. A critical heuristic identified the CVE-2008-2992 exploit, indicating the PDF launcher concatenates metadata fields, extracts characters at a fixed stride, and evaluates the result. This process likely leads to the execution of the deobfuscated JavaScript (`numeric_charcode_stage_000.js`), which is suspected to download and execute a second-stage payload. The lack of specific indicators for a known family leads to an 'unknown family' classification.

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` `86930f42907a0101d75bd24fe84ff7329d748eab014d2437e7451fe4b4fb1a89`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20421 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` `406d2775fb6bc7e896c8141c94ff95f41ba5823d1ff150f7f6e5e7ddbe7f311a`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6020 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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