PDF malware analysis — malicious · d7b0201982069b9a

MALICIOUS

PDF

4.4 KB

MD5: 16aca3041719dd587e66f29d01a57c34 SHA-1: 8358b15e942532ef9a7db1051d01406751eefcb9 SHA-256: d7b0201982069b9a5ce234373f486e9ebb223ff2a2b590850a75f7eff0a18cf9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2008_2992 heuristic firing points to the exploitation of a known PDF vulnerability using `util.printf` to decode and execute JavaScript. The embedded JavaScript streams, particularly 'numeric_charcode_stage_000.js', likely contain obfuscated code designed to download and execute a secondary payload. The presence of `eval()` and `String.fromCharCode` further supports the interpretation of 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` `64e9ee0f54cc9ffa749b25fd12d7bc3c642f1be0987becfba046be03af20b816`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23236 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` `1aff71a70dca280f76d82a268ac6a09e7205579634c520c3ad09f4def098c70c`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6846 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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