PDF malware analysis — malicious · b4659e77dfecc1f2

MALICIOUS

PDF

12.3 KB

MD5: 275ac29e8487ba83bad8e363c645d320 SHA-1: 2bb01751b1c3415f27df9d3f4c70e280c6ebdd30 SHA-256: b4659e77dfecc1f273a5c9022e3824111dec563eac1875e6b9f2034826c9b71c

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 the exploitation of a known vulnerability using JavaScript that is obfuscated and concatenated from the file's metadata. The extracted JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, suggest a multi-stage process, typical of downloaders. The primary function appears to be the execution of arbitrary code via the Collab.collectEmailInfo method.

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` `35064de9386b7e9133f74b944f1ee62877c048dd2f8946825b36c14b2c3467cd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12016 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `52a9b3eb2f5b9f23545c9c6dd6056275068ee3dca1c3359da1728fe4623e0dc8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	4916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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