PDF malware analysis — malicious · 8b908c1ffa178059

MALICIOUS

PDF

23.9 KB

MD5: 66fbf327a83cdc458d7d17d3b2c260f4 SHA-1: 6be2983a1034950552d202c8a3d4742ce2978789 SHA-256: 8b908c1ffa1780591b2abb8c8b056605c12a689dfb98c50bbf5f22119ef2cf27

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2009-0927 vulnerability (Collab.getIcon). The JavaScript is heavily obfuscated using string concatenation and eval/unescape functions, making it difficult to fully deobfuscate statically. However, the presence of the CVE trigger and the structure of the obfuscated code strongly suggest that the script's primary purpose is to download and execute a secondary payload from a remote source. The extracted JavaScript streams and deobfuscated stages confirm the use of eval() and unescape(), typical of exploit kit delivery mechanisms.

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` `1f2f4a6eb67c3456f6cfb0e3a9060cd475da1ef6fb29e3493703639122b3a6c5`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3512 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `6aa4d61bb52343bfe29d64fd0ca33b129df75adc727c79e9a704fc2d8084bdfb`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF7C	18551 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_obj111713_002.js` `bc0eabbdbb8067197df77d31fd6dfef678019d3b9517970318ec4243163e032d`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5829	1789 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `f89df567ac1524aa97d7d1c2e318640fc4fa1525d608905c9904da2f1b756863`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF7C	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 0x5829	99 bytes
`legacy_pdfkit_stage_002.js` `dc78df585d182821914bfce7ae120a8a07a2619423f5971ee3f213237f40a51d`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF7C	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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