PDF malware analysis — malicious · f0146a40d1d8df04

MALICIOUS

PDF

12.5 KB

MD5: 2ed898369ae453592d791978c115f11a SHA-1: 2a0248653320db08bdf0df54f8b41d10e2f15517 SHA-256: f0146a40d1d8df04764aef3ed01f9c4060d2c367333f9b99afe27e555eedf089

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates that the JavaScript is used to exploit a known vulnerability (Collab.collectEmailInfo) to collect information and likely execute further code. The deobfuscated JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are suspicious artifacts that likely contain the malicious payload or downloader. The exact function of these scripts is not fully discernible without further dynamic analysis, but their presence and the exploit heuristic strongly suggest a multi-stage attack.

Heuristics 4

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `f5f16930080910067e684710dc949d1fabc3168e0e5142842a5bf4f2f77e752b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12194 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `64a19b877cd267a5b428c1b8ccf811e397f7581006c0808e193e1f8d4665f8e3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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