PDF malware analysis — malicious · c22215fe424a0c48

MALICIOUS

PDF

12.7 KB

MD5: c4993680669bd531e8e95195bc71dcc4 SHA-1: f7d610d918c6c66229bdb53358cfa11508dc77d2 SHA-256: c22215fe424a0c484e91ccb64aa4dc7d36ccb5e4df8accc829931ecf3b274009

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exploits CVE-2007-5659 using embedded JavaScript. This JavaScript is further deobfuscated into two stages, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The primary function of these scripts appears to be downloading and executing a second-stage payload, indicated by the critical heuristic firing for Collab.collectEmailInfo and the presence of suspicious extracted JavaScript files. The exact download URL or payload is not directly evident from the provided static analysis, hence the unknown family.

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` `7b24176e1c76478d8598ef55688dac42587f28911bb816fad3343e2d5c664373`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12382 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `36929eb847672f65a654a57be7e603123e2b34fffb7099dccbce89f5f9b22060`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5182 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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