PDF malware analysis — malicious · 8f171d8d59c7a19f

MALICIOUS

PDF

4.2 KB

MD5: 2c659b087bd3fd8dba251769044f5135 SHA-1: 7fc86fd36becce38d70a426335dcc5a2b3d2b9c7 SHA-256: 8f171d8d59c7a19f14e64612ecddefecb05f00e2c6ec357ad8adba9364e02a0e

128 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) that leverages `util.printf` and `eval()`. The deobfuscated JavaScript stream indicates that the script is designed to download and execute a second-stage payload. The presence of multiple JavaScript streams and obfuscation indicators suggests a downloader or droppper functionality.

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` `691edfbe57e33e7def388b6edd170d467232249df534c18694aa6999f28bc9da`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21450 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` `f974768103a30327064d23100d8386a4bf66bc7e9b951fdf0f69f47bd0ace131`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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