PDF malware analysis — malicious · 5921f9c6696658ec

MALICIOUS

PDF

12.7 KB

MD5: 0f1ac4895fa784b584e4d00e0cf75272 SHA-1: 6ba757ddb21d0807110afeab0dc2382bb6e803b2 SHA-256: 5921f9c6696658ecef94a32e82750d54f387925847d9b97c61eea414fd3c5d53

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell 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 embedded JavaScript is used to exploit a known vulnerability (Collab.collectEmailInfo) to launch further malicious code. The deobfuscated JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are suspicious artifacts that likely contain the payload execution logic. The exact intent of the script is not fully discernible due to potential obfuscation, but it is highly probable that it downloads and executes a second-stage payload.

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` `7973305a02df063808c8b2e2b9ba349866a7af884b6f2dddc7f149a9c75b305d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12502 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `3359c69da5596b8ccacadc0728e5d2e57f449f384a2b459a4e2a0397f2cdf3d0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5129 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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