PDF malware analysis — malicious · 30364fe03ae86f07

MALICIOUS

PDF

9.4 KB

MD5: b9ef67d668a981f8130eef769f5fe38a SHA-1: bd813adbd39882685784661e5755fc0c3b9c1452 SHA-256: 30364fe03ae86f07bdba0ea1bf1fab4e296f2384a3757d1653743570691f3a7a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and then decoded using a hex decoder. This JavaScript is designed to exploit the CVE-2007-5659 vulnerability in Adobe Reader, specifically targeting the `Collab.collectEmailInfo` function. The primary goal appears to be the execution of a second-stage payload, as indicated by the 'stager' naming convention in the extracted artifacts. No specific malware family could be identified.

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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `5f74f7dcd9300f67a8f3a5393cd0bcc6e00d589694e79d549fee4f5b5f8aff7d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5049 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` `ef32b19f293f61ade387ae7acf503b66ce72f29267ecbb8d13614d944a1edaf8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	11959 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` `1b5ed67842e14863ae2b29e58ca51ee1c9360fd9b2caf757a12b574a3e50db46`	deobfuscated-js	PDF JavaScript deobfuscation pass	43149 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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