PDF malware analysis — malicious · 9b98952aefa80e11

MALICIOUS

PDF

12.3 KB

MD5: 1f3169508afd5cae842c50ee15b0af6c SHA-1: 52eefde5f1576ae4b7c22c619906dfd92d7c0942 SHA-256: 9b98952aefa80e114f445e5ee32e33a54d2dcc5ba53564cfbe2ac75a64b5f81b

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates that the sample exploits a known vulnerability in Adobe Reader using a specific JavaScript technique involving the Collab.collectEmailInfo method. This technique is used to deobfuscate and execute JavaScript, which is likely intended to download and execute a second-stage payload. The extracted JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, further support this analysis.

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` `5b5c761b3d2389bc3ed18a70a0e52c784b194833cc48a82ddc4e463d13a31120`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12070 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `4ff39cc9b16ae0470c0410b07f27df169eabfe635fe0b0618189f354595e0d8f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	4970 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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