PDF malware analysis — malicious · 73f811b0c6bca75f

MALICIOUS

PDF

4.1 KB

MD5: c629dbee7d48cbe579c5e2987b7314e3 SHA-1: e8b7ba2071a8adc69486e6ffa3a02f83a4093558 SHA-256: 73f811b0c6bca75fa14d4a0a84e423a9ebb49928bdc152c8dbfeb361b2e72ee6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is executed using a known vulnerability (CVE-2008-2992). The JavaScript utilizes `eval()` and `String.fromCharCode()` for obfuscation, and the `util.printf` function is a strong indicator of this specific exploit. The primary intent appears to be the execution of further malicious code, likely a downloader for a second-stage payload.

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` `cc9ea4b5e60afcb93c9ef4a7cf4d907275a91ba8448e2aa810bc355d2a5e6b9b`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20985 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` `6b9aa184a83b4bc5813fb26581c43ac911ee8ca82d11579f1192d58e8d166499`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6155 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.