PDF malware analysis — malicious · 939adcf4cd1e79a6

MALICIOUS

PDF

11.9 KB

MD5: bcf9cc2dff5878f71a1abd1508b16820 SHA-1: 83da36663d3469087315c3f6a14fdb7003d48b23 SHA-256: 939adcf4cd1e79a67abcb8c9e6de8fd47abdb391d861286d54141893fd97bf08

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the 'Collab.collectEmailInfo' method, which is a known vulnerability (CVE-2007-5659). The critical heuristic indicates that this JavaScript acts as a stager, decoding a hex-encoded payload. This payload is likely responsible for downloading and executing a second-stage malicious artifact. The presence of obfuscated JavaScript and the exploitation of a specific PDF vulnerability point to a downloader or dropper functionality.

Heuristics 5

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)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
`annotation_subject_callee_hex_stage_000.js` `c0c3f9b5c5b22cfc1950769d3dc04ac176688882fdb4a0b1cd72fb33efd1131a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	4965 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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