PDF malware analysis — malicious · af3d06bcdd9b3621

MALICIOUS

PDF

21.4 KB

MD5: a94d2941a8e820c006e8325373bbcc6f SHA-1: 75caa367f8a8227f8eb9b55a97fa1317aa39d145 SHA-256: af3d06bcdd9b36211c8c011c8a630051ec847e5f068934528f86c50fc6604bd2

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that utilizes eval() and unescape() functions, indicative of obfuscation. The critical CVE-2007-5659 heuristic confirms the exploitation of a known vulnerability in Adobe Reader via the Collab.collectEmailInfo function. The JavaScript is designed to download and execute a second-stage payload, as evidenced by the deobfuscated scripts and the heuristic firings.

Heuristics 5

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (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` `9bc79f612ca6043c4c1876109ec587a044fc8c4971187243eacd1803e3977db2`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3495 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` `ba54615f6fa977933b32842babe1189062511c7c1270b6f4355d939f18578fa5`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF6B	16199 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` `b380510f3933b5d0aad4f1c8e9e001bf499913aa0f60299203fef08115e8fc2f`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4EE8	1633 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` `3ce2f209b540fb36eed49cc31ae3f37f7cea4ebc079e3cbb3b999b83a97c1eae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF6B	1469 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` `f6c1e0d539fa416d4bb9621dffa2f685163f5ce38c1d0c90bf982d1d1794bb57`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4EE8	88 bytes
`legacy_pdfkit_stage_002.js` `2c16700f6b7bad453698e40edce2d0b10849493bc39fc87bbc3980a0d3e12893`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF6B	1558 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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