PDF malware analysis — malicious · 8fe88b675d181d3d

MALICIOUS

PDF

9.7 KB

MD5: 5dc032858fa10c5da9a6322f3a1cf5c0 SHA-1: 6e6883ddbaa027f67c0aea4899f23ab407e2503f SHA-256: 8fe88b675d181d3d193bf4a1d0f0f7b9a5e574da5980f0930f3e23886fe1990e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a critical heuristic indicating the exploitation of CVE-2007-5659 via a JavaScript stager embedded in an annotation's subject. This stager is further processed by a hex decoder before execution. The deobfuscated JavaScript, totaling over 50KB, likely downloads and executes a second-stage payload. The presence of multiple JavaScript streams and the specific CVE exploitation point to a sophisticated delivery mechanism.

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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `d2449012613f97b28ab34ab2372b128053ed33c45fb1bde474fb65f8695dcd94`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `eec7234d0b49d606a171f38d56abf03ed46f77e2259bdb5b1b2f45f3949099ed`	deobfuscated-js	PDF JavaScript deobfuscation pass	48780 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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