PDF malware analysis — malicious · bdd45b0acea1f755

MALICIOUS

PDF

22.8 KB

MD5: 4100fa2d8246828690d477f103bb24ef SHA-1: e341ae373803df626295c488a6cf00e4fede9b43 SHA-256: bdd45b0acea1f7554f96b760f8ce1409166889262fa36961b492f64fea922384

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains heavily obfuscated JavaScript, including multiple calls to eval() and unescape(). The critical heuristic firing CVE_2009_0927 indicates the use of a known exploit for Adobe Reader, specifically targeting the Collab.getIcon function. The embedded JavaScript streams and deobfuscated stages suggest the primary intent is to download and execute a second-stage payload, likely leveraging the obfuscated code to bypass detection.

Heuristics 5

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `e2f33200bbd0c0a9cc4592f0bcbe5bdc8a91f3ca034df622a03cf195e2f6ae1c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3526 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `20839c62852872db47c980201e555d9476840eed46eb4ccd729916ec3248e723`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF8A	17765 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `16599be7b5c2369a8076e9a1ee25a051a36019fb879d97e60f2b087e6c21991f`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5525	1489 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `42c6e0dfc1b4e08e336adc8028ccac82b04e3e6e9e4d4a4ebc532ab6cd132eec`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF8A	1520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `95d52c265d60ffad372da99bb3db5c3f0b48fc84b1aaa90902895f12786cdc82`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5525	99 bytes
`legacy_pdfkit_stage_002.js` `82baf83c245d2823a5fa2fdd812a45c171a1eb272143e00b062f225348025f4c`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF8A	1620 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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