PDF malware analysis — malicious · de158ec6c8867c1d

MALICIOUS

PDF

23.0 KB

MD5: 9ee68d9899c15b3020c557bc01a1b60f SHA-1: 1d342d79279fc3f7dec2150d53b7f36cd4a4b533 SHA-256: de158ec6c8867c1de21a7926a82203d23f9abf66d8755553478d9860a7cf2b99

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams, with a critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo). The obfuscated JavaScript uses eval() and unescape() functions, indicating an attempt to hide malicious code. The primary intent appears to be exploiting this vulnerability to download and execute a secondary payload, as suggested by the deobfuscated JavaScript artifacts.

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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `f3d8cc79ac29261c49496845384905a83944e72a15ae52bd8abdb83328bd41b6`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3902 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` `1d6b2e2399ca45a83804ddbaf8dd125857bedadf24ea59fec05db9434b9697dc`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1102	17581 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` `93ce3b2e12215be325d14a7bb08755a1b8aca4766a24b80f9cfde2fab0e400ec`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x55E5	1527 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` `606e15032dfabf8d67885bfafd0c3773a795012e9168ff3e80e489c81fe42cd4`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x1102	16847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 46 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `603478db42b8093812f18b111347f30002f4f470cfbb38a049941940d5929593`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x1102	16841 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 46 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `fd4a573f8560b7665161d76243aa155e46796fd509911599815e749e3c71df64`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1102	1469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `66201566cb7b94b96d78c07e61c80e11578b5125ea85cc864e3cc788698af3dd`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x55E5	79 bytes
`legacy_pdfkit_stage_004.js` `ff0435eaf612834565e63bbd43b93a2d1c5bb94acc6bd340852f5909a0377577`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1102	1549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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