PDF malware analysis — malicious · 393d39c854e7cb7f

MALICIOUS

PDF

9.5 KB

MD5: 9f239cf68f2549c4139417cac8fdad6f SHA-1: f99d629a1c0cb69ec166236b5f65576e23417fad SHA-256: 393d39c854e7cb7f81f4f89380fd10a5b8c1c5c14aa05d7a4920dc29b837b8b4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to 'collab.collectEmailInfo'. The analysis indicates that this JavaScript acts as a stager, decoding and executing further malicious code. The presence of multiple deobfuscated JavaScript files suggests a complex multi-stage payload delivery mechanism. The primary attack vector appears to be exploiting a known PDF vulnerability to achieve arbitrary code execution.

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `d996bcbaadc75804e1dd8c3ca73804ccbfdea330a4ccb1c818660d90e72771c9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5111 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `38a46c2b77b17ab5c4da235c3b1fcda4a3420fa407b0f49e6369b7ea7d2bbde1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12154 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `c36553175eced43a92137bef19fa8b46886fddb0ad92c8b72401286efcd12aaf`	deobfuscated-js	PDF JavaScript deobfuscation pass	69011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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