PDF malware analysis — malicious · 96872f2a2e335206

MALICIOUS

PDF

11.7 KB

MD5: 303954a2c9880a753ca2112c53abf115 SHA-1: 2d8d43ca2806e5c5d57410a02091e1f9e40bdb3e SHA-256: 96872f2a2e3352069b244adff15a4c6584ad6850e8b07b17d32ab16d48bb679c

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to the `Collab.collectEmailInfo` function. The analysis recovered multiple JavaScript files, including a large 'deobfuscated.js' and 'legacy_pdfkit_stage_001.js', indicating a complex stager mechanism. The primary intent appears to be the execution of this JavaScript, which likely downloads and executes a second-stage payload, as suggested by the 'hex stager' heuristic.

Heuristics 7

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-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `c7e234cc7fa27d1b4d06ec9a30787b079fcace63fd7175ad9fe1df434192585a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4990 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` `0f95c36e04f4781242bc1f37c38b6ab6731f6a04c82947b9401ac58b36f5f6c5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12011 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` `07b99fa61faf23fb1dd86bcd88955e1a4f896e81b84461a4406a2241ac1f37ff`	deobfuscated-js	PDF JavaScript deobfuscation pass	76602 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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