PDF malware analysis — malicious · b306883fe2bd8a70

MALICIOUS

PDF

9.3 KB

MD5: 5582cc8ca1dfd83d42643e736d1dd380 SHA-1: a8dc3154fdaabe8362b5535788762d66d2b07a7e SHA-256: b306883fe2bd8a705fdf6ca8702fa1ffb6c0106d559bcd2a7c109c8c491ffa41

304 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript that utilizes the `unescape()` and `eval()` functions, indicating an attempt to obfuscate and execute malicious code. Specifically, the `CVE_2007_5659` heuristic firing points to the use of the `Collab.collectEmailInfo` method, a known exploit primitive for this CVE. The embedded JavaScript is heavily obfuscated, making its exact payload difficult to determine without further dynamic analysis, but the techniques used strongly suggest it's designed to download and execute a secondary malicious payload. The presence of multiple deobfuscated JavaScript files further supports this.

Heuristics 9

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)
ClamAV: Pdf.Exploit.Agent-35912 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35912
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
Suspicious extracted artifact high 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.
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)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `7218a1c68060953321573daa035b16f5f32928ce25a9eb656690dbe78cd9464e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `752de3c2dd0b4907eda3fd458d3bbc9ebe462b201b3f0ef56ad77555699bd1f4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4971 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `8e6f5984e8ef9bee1548bf414d629256518ad61fe2e665e78a533900905b4d70`	deobfuscated-js	PDF JavaScript deobfuscation pass	40984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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