PDF malware analysis — malicious · 4dc9b0c20ea61d91

MALICIOUS

PDF

211.3 KB

MD5: 930fc7badacf1a19816a97775662ae54 SHA-1: d950e144b4c5a3eaacd2d9ed22b4c63264f70426 SHA-256: 4dc9b0c20ea61d91d6a1b5bdce76fb5365de0762efb8f6c2925113c6a8950cae

80 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF sample exploits CVE-2007-5659 using embedded JavaScript. The critical heuristic indicates the PDF builds a string-reversal helper and decodes reversed string chunks into an eval'd stage. This suggests the primary purpose is to download and execute a secondary payload, likely from a URL embedded within the obfuscated JavaScript.

Heuristics 5

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)
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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` `509b3be2d8769a21ebc122727b5cb53085708ac85036abd114ef8571b6f14516`	pdf-javascript-stream	PDF /JS object 7 at offset 0x32A7F	47 bytes
`javascript_obj0019_001.js` `f7996b968ec3961238f6614a14f2e6f66047ef26304ee3b18c0272e2f61c7bcb`	pdf-javascript-stream	PDF /JS object 19 at offset 0x32EA0	17497 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `c8bdef46f9ce63b52c9b556eb1b8887a53acd5405e1e18a2e8cb985c261fab0b`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x32EA0	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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