PDF malware analysis — malicious · 219d001b07567dee

MALICIOUS

PDF

4.2 KB

MD5: c15324e8a3bf922c14bae652ab65ddc2 SHA-1: 1da275363aaafff095e2655d36ac6dfa927f6465 SHA-256: 219d001b07567dee4f110db890fa6b42f309299dbad3a13653e7bc49e703ba3a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. The critical CVE-2008-2992 heuristic indicates that the PDF launcher concatenates specific info fields, extracts characters at a fixed stride, and then evaluates the resulting string. This strongly suggests the script is designed to download and execute a second-stage payload. The deobfuscated JavaScript file `numeric_charcode_stage_000.js` was extracted, but its specific actions are not detailed in the provided evidence beyond its obfuscated nature.

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` `b11909dfc569abe9ac95e84b0eda269caf458dadba935d4e22cdd90a8972c238`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22141 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` `dceda9f6e60f6579ac409a4878634a88079bb9b1021af3e6d02224daeb0aae58`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6512 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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