PDF malware analysis — malicious · 252ef3a04ac62d84

MALICIOUS

PDF

9.7 KB

MD5: 877ad930c35cef11410096449102888a SHA-1: 470a009f092d0c43e40c5bedd5f68e442fb988e9 SHA-256: 252ef3a04ac62d8461fcfd4701a48e2abe356bf4655b54c640e3398061e28ece

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious Script

The PDF document contains embedded JavaScript, triggered by the 'Collab.collectEmailInfo' method, which is a known vulnerability (CVE-2007-5659). This JavaScript acts as a stager, decoding and executing a larger, obfuscated JavaScript payload. The primary function of this payload appears to be the execution of further malicious code, likely a second-stage downloader or implant, based on the complexity and obfuscation observed. No specific family could be identified due to the generic nature of the exploit and stager.

Heuristics 6

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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `bf32aae780514d0c971e4857735c4452b4c1c55e032333bce60536d6e811f0b5`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5235 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `3a7e734a0bed030a5b66819830cfcf611a18397e2da511535ad24442ab1415ed`	deobfuscated-js	PDF JavaScript deobfuscation pass	43667 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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