PDF malware analysis — malicious · 87b5ec2505056e9f

MALICIOUS

PDF

4.2 KB

MD5: e9a31570cb3300899b4aaaaf5c5f96af SHA-1: 0538b46922990d49432a9142be95482626bd475c SHA-256: 87b5ec2505056e9fae52fcefc82374a91b334cbda220a05a44da3d5950f29466

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic confirms the exploitation of this vulnerability via util.printf to decode and execute JavaScript. The extracted JavaScript streams, particularly 'numeric_charcode_stage_000.js', likely contain the second-stage payload, though its exact nature requires further analysis. The primary attack vector is the exploitation of a known PDF vulnerability to achieve arbitrary 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` `c09a37bea275966abc950b11de2a95007b812d7ccb30466897d74f93923bf5ae`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21449 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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